diff --git a/includes/admin/class-pr-core-admin-columns.php b/includes/admin/class-pr-core-admin-columns.php
index dd8bee7..bcab3d5 100644
--- a/includes/admin/class-pr-core-admin-columns.php
+++ b/includes/admin/class-pr-core-admin-columns.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Adds evidence strength, editorial status, and dosing count columns
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Custom admin list-table columns for the peptide CPT.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: PR_Core_Dosing_Repository for row counts.
  *
  * @see admin/class-pr-core-admin.php — Registers column hooks.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Admin_Columns {
 
diff --git a/includes/admin/class-pr-core-admin.php b/includes/admin/class-pr-core-admin.php
index 2690e0f..717cb25 100644
--- a/includes/admin/class-pr-core-admin.php
+++ b/includes/admin/class-pr-core-admin.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Registers admin menu pages, meta boxes, and custom columns for peptides
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Admin initialization and hook registration.
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  * @see admin/class-pr-core-verification-metabox.php — Verification sidebar meta box.
  * @see admin/class-pr-core-candidate-queue-page.php — Candidate review screen.
  * @see admin/class-pr-core-admin-columns.php        — Custom list-table columns.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Admin {
 
diff --git a/includes/admin/class-pr-core-ajax-handlers.php b/includes/admin/class-pr-core-ajax-handlers.php
index ca48a5f..bda9b13 100644
--- a/includes/admin/class-pr-core-ajax-handlers.php
+++ b/includes/admin/class-pr-core-ajax-handlers.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Handles mark-verified and scan-now admin-ajax actions
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * AJAX handlers for verification scanner actions.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see admin/class-pr-core-peptide-metaboxes.php — "Mark verified today" button in sidebar.
  * @see admin/class-pr-core-verification-widget.php — "Scan now" button in dashboard widget.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Ajax_Handlers {
 
diff --git a/includes/admin/class-pr-core-candidate-queue-page.php b/includes/admin/class-pr-core-candidate-queue-page.php
index 17cea5d..81dbeaa 100644
--- a/includes/admin/class-pr-core-candidate-queue-page.php
+++ b/includes/admin/class-pr-core-candidate-queue-page.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Renders a review screen for AI-extracted dosing candidates
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Admin page for the AI Candidate Queue.
  *
@@ -12,7 +18,6 @@ declare(strict_types=1);
  *
  * @see admin/class-pr-core-admin.php                              — Menu registration.
  * @see repositories/class-pr-core-candidate-queue-repository.php  — Data layer.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Candidate_Queue_Page {
 
@@ -59,8 +64,8 @@ class PR_Core_Candidate_Queue_Page {
 			$peptide = $pep_repo->find_by_id( $c->peptide_id );
 			$name    = $peptide ? $peptide->title : '#' . $c->peptide_id;
 
-			$dose = $c->dose_min !== null ? number_format( $c->dose_min, 2 ) : '?';
-			if ( $c->dose_max !== null && $c->dose_max !== $c->dose_min ) {
+			$dose = null !== $c->dose_min ? number_format( $c->dose_min, 2 ) : '?';
+			if ( null !== $c->dose_max && $c->dose_max !== $c->dose_min ) {
 				$dose .= ' – ' . number_format( $c->dose_max, 2 );
 			}
 			$dose .= ' ' . esc_html( $c->dose_unit );
@@ -95,7 +100,7 @@ class PR_Core_Candidate_Queue_Page {
 			printf( '<td>%s</td>', esc_html( $c->route ) );
 			printf( '<td>%s</td>', esc_html( $dose ) );
 			printf( '<td>%s</td>', esc_html( $c->population ) );
-			printf( '<td>%s</td>', $study ); // Contains escaped HTML + link.
+			printf( '<td>%s</td>', $study ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- $study is pre-escaped HTML.
 			printf( '<td>%s</td>', esc_html( $confidence_pct ) );
 			printf(
 				'<td><a href="%s" class="button button-primary button-small">%s</a> <a href="%s" class="button button-small">%s</a></td>',
@@ -118,7 +123,7 @@ class PR_Core_Candidate_Queue_Page {
 	 * @return void
 	 */
 	private function handle_actions(): void {
-		$action = sanitize_text_field( $_GET['action'] ?? '' );
+		$action = sanitize_text_field( wp_unslash( $_GET['action'] ?? '' ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated
 
 		if ( ! in_array( $action, array( 'pr_core_approve', 'pr_core_reject' ), true ) ) {
 			return;
@@ -128,7 +133,7 @@ class PR_Core_Candidate_Queue_Page {
 			return;
 		}
 
-		$candidate_id = absint( $_GET['candidate_id'] ?? 0 );
+		$candidate_id = absint( wp_unslash( $_GET['candidate_id'] ?? 0 ) );
 		if ( 0 === $candidate_id ) {
 			return;
 		}
diff --git a/includes/admin/class-pr-core-peptide-metaboxes.php b/includes/admin/class-pr-core-peptide-metaboxes.php
index 8f92264..d5b2935 100644
--- a/includes/admin/class-pr-core-peptide-metaboxes.php
+++ b/includes/admin/class-pr-core-peptide-metaboxes.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Renders and saves three meta boxes on the peptide edit screen
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Meta boxes for the peptide edit screen: scientific identifiers, dosing, and legal.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see admin/class-pr-core-admin.php — Registers these hooks.
  * @see cpt/class-pr-core-peptide-cpt.php — Meta field definitions.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Peptide_Metaboxes {
 
diff --git a/includes/admin/class-pr-core-repo-daily-metaboxes.php b/includes/admin/class-pr-core-repo-daily-metaboxes.php
index 9e8d597..d1b1b0d 100755
--- a/includes/admin/class-pr-core-repo-daily-metaboxes.php
+++ b/includes/admin/class-pr-core-repo-daily-metaboxes.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Renders and saves two meta fields on the repo_daily edit screen
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Meta boxes for Repo Daily edit screen: author and clinical review flag.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see admin/class-pr-core-admin.php — Registers these hooks.
  * @see cpt/class-pr-core-repo-daily-cpt.php — CPT definition.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Repo_Daily_Metaboxes {
 
diff --git a/includes/admin/class-pr-core-settings-renderer.php b/includes/admin/class-pr-core-settings-renderer.php
index 663d0c3..c77ddf1 100644
--- a/includes/admin/class-pr-core-settings-renderer.php
+++ b/includes/admin/class-pr-core-settings-renderer.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Static methods that output HTML for each settings field on the PR Core settings page
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Render methods for the PR Core settings admin page.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: PR_Core_Settings (for option key constants).
  *
  * @see admin/class-pr-core-settings.php — Settings registration and sanitization.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Settings_Renderer {
 
diff --git a/includes/admin/class-pr-core-settings.php b/includes/admin/class-pr-core-settings.php
index 178e961..ccb4fad 100644
--- a/includes/admin/class-pr-core-settings.php
+++ b/includes/admin/class-pr-core-settings.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Static admin settings class
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Settings page for PR Core plugin configuration.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  * Dependencies: PR_Core_Peptide_CPT (for CAPABILITY constant).
  *
  * @see class-pr-core.php — Registers admin_menu + admin_init hooks pointing here.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Settings {
 
diff --git a/includes/admin/class-pr-core-verification-metabox.php b/includes/admin/class-pr-core-verification-metabox.php
index abe058c..21c4a7c 100644
--- a/includes/admin/class-pr-core-verification-metabox.php
+++ b/includes/admin/class-pr-core-verification-metabox.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Renders and saves verification status sidebar meta box
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Verification status meta box for peptide edit screen.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: None.
  *
  * @see admin/class-pr-core-peptide-metaboxes.php — Other edit-screen meta boxes.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Verification_Metabox {
 
diff --git a/includes/admin/class-pr-core-verification-widget.php b/includes/admin/class-pr-core-verification-widget.php
index 8b7d21e..aa3ba0b 100644
--- a/includes/admin/class-pr-core-verification-widget.php
+++ b/includes/admin/class-pr-core-verification-widget.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * WordPress dashboard widget showing peptides needing review (due/overdue)
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Dashboard widget for verification status overview.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: PR_Core_Peptide_Repository.
  *
  * @see scanner/class-pr-core-verification-scanner.php — Computes status via run_scan().
- * @package Peptide_Repo_Core
  */
 class PR_Core_Verification_Widget {
 
diff --git a/includes/api/class-pr-core-rest-controller.php b/includes/api/class-pr-core-rest-controller.php
index 8e4dac0..6186cef 100644
--- a/includes/api/class-pr-core-rest-controller.php
+++ b/includes/api/class-pr-core-rest-controller.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Exposes peptides, dosing rows, and legal cells via REST endpoints
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * REST API controller for peptide data (read-only public, write requires capability).
  *
@@ -19,7 +25,6 @@ declare(strict_types=1);
  *   POST /peptides/{id}/legal               — Add legal cell (auth)
  *
  * @see ARCHITECTURE.md — REST API specification.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Rest_Controller {
 
diff --git a/includes/class-pr-core-activator.php b/includes/class-pr-core-activator.php
index f8d0b38..946ae44 100644
--- a/includes/class-pr-core-activator.php
+++ b/includes/class-pr-core-activator.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Runs migrations, adds capabilities, flushes rewrite rules
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Plugin activation handler.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see peptide-repo-core.php — Registers this class on activation.
  * @see includes/class-pr-core.php — Wires the init:999 version-change handler.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Activator {
 
diff --git a/includes/class-pr-core-autoloader.php b/includes/class-pr-core-autoloader.php
index 47642fb..6433ea8 100644
--- a/includes/class-pr-core-autoloader.php
+++ b/includes/class-pr-core-autoloader.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Resolves PR_Core_ class names to file paths under includes/
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * SPL autoloader for PR_Core_ prefixed classes.
  *
@@ -12,7 +18,6 @@ declare(strict_types=1);
  * Scans includes/ and all immediate subdirectories.
  *
  * @see peptide-repo-core.php — Registers this autoloader at boot.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Autoloader {
 
diff --git a/includes/class-pr-core-deactivator.php b/includes/class-pr-core-deactivator.php
index f06595a..eeb7dd5 100644
--- a/includes/class-pr-core-deactivator.php
+++ b/includes/class-pr-core-deactivator.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Flushes rewrite rules on deactivation (data preserved)
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Plugin deactivation handler.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see peptide-repo-core.php — Registers this class on deactivation.
  * @see uninstall.php         — Full data teardown happens on uninstall, not deactivation.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Deactivator {
 
diff --git a/includes/class-pr-core-seed-data.php b/includes/class-pr-core-seed-data.php
index bc15d7e..b03a7cb 100644
--- a/includes/class-pr-core-seed-data.php
+++ b/includes/class-pr-core-seed-data.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Creates 3 peptide posts, 10 dosing rows, and 5 legal cells using fixture data
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Seed data orchestrator for development and testing.
  *
@@ -11,7 +17,6 @@ declare(strict_types=1);
  *
  * @see class-pr-core-seed-fixtures.php — Static fixture data arrays.
  * @see ARCHITECTURE.md — Seed data specification.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Seed_Data {
 
diff --git a/includes/class-pr-core-seed-fixtures.php b/includes/class-pr-core-seed-fixtures.php
index 16e8c66..6fd89ec 100644
--- a/includes/class-pr-core-seed-fixtures.php
+++ b/includes/class-pr-core-seed-fixtures.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Provides hard-coded peptide, dosing, and legal data used by PR_Core_Seed_Data
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Static seed data fixtures for development and testing.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: None.
  *
  * @see class-pr-core-seed-data.php — Orchestrator that consumes these fixtures.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Seed_Fixtures {
 
diff --git a/includes/class-pr-core.php b/includes/class-pr-core.php
index 2a2810e..7001a7c 100644
--- a/includes/class-pr-core.php
+++ b/includes/class-pr-core.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Registers all hooks, runs migrations, boots subsystems
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Main orchestrator for the Peptide Repo Core plugin.
  *
@@ -12,7 +18,6 @@ declare(strict_types=1);
  *
  * @see peptide-repo-core.php — Bootstrap that instantiates this class.
  * @see ARCHITECTURE.md    — Full data flow diagram.
- * @package Peptide_Repo_Core
  */
 class PR_Core {
 
diff --git a/includes/core/class-pr-core-internal-posts-provider.php b/includes/core/class-pr-core-internal-posts-provider.php
index 4b1bfdb..9f78eb3 100644
--- a/includes/core/class-pr-core-internal-posts-provider.php
+++ b/includes/core/class-pr-core-internal-posts-provider.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Implements PR_Core_Related_Posts_Provider by querying posts tagged
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Fetches posts related to a peptide via taxonomy and fallback text search.
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  *
  * @see includes/interfaces/interface-related-posts-provider.php
  * @see includes/core/class-related-posts-section.php
- * @package Peptide_Repo_Core
  */
 class PR_Core_Internal_Posts_Provider implements PR_Core_Related_Posts_Provider {
 
diff --git a/includes/core/class-pr-core-related-posts-provider.php b/includes/core/class-pr-core-related-posts-provider.php
index ea2f1a3..f2b1c59 100644
--- a/includes/core/class-pr-core-related-posts-provider.php
+++ b/includes/core/class-pr-core-related-posts-provider.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Interface defining the get_posts() contract for related-post providers
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Contract for any provider that retrieves posts related to a peptide.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see includes/core/class-pr-core-internal-posts-provider.php — default implementation.
  * @see includes/core/class-pr-core-related-posts-section.php   — consumer.
- * @package Peptide_Repo_Core
  */
 interface PR_Core_Related_Posts_Provider {
 
diff --git a/includes/core/class-pr-core-related-posts-section.php b/includes/core/class-pr-core-related-posts-section.php
index 104132d..83a78b4 100644
--- a/includes/core/class-pr-core-related-posts-section.php
+++ b/includes/core/class-pr-core-related-posts-section.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Hooks into pr_core_after_peptide_content and renders a card grid
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Renders the related articles section on peptide single pages.
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  * - pr_core_related_posts_enabled (bool, default true)
  * - pr_core_related_posts_limit (int, default 3, range 1-6)
  *
- * @package Peptide_Repo_Core
  */
 class PR_Core_Related_Posts_Section {
 
diff --git a/includes/cpt/class-pr-core-peptide-cpt.php b/includes/cpt/class-pr-core-peptide-cpt.php
index 3a1aa49..33db368 100644
--- a/includes/cpt/class-pr-core-peptide-cpt.php
+++ b/includes/cpt/class-pr-core-peptide-cpt.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Defines peptide CPT with REST support, archive, and meta fields
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Registers the peptide custom post type and associated taxonomy.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see ARCHITECTURE.md
  * @see CONVENTIONS.md
- * @package Peptide_Repo_Core
  */
 class PR_Core_Peptide_CPT {
 
diff --git a/includes/cpt/class-pr-core-peptide-meta-schema.php b/includes/cpt/class-pr-core-peptide-meta-schema.php
index 9771a6b..9bb24ec 100644
--- a/includes/cpt/class-pr-core-peptide-meta-schema.php
+++ b/includes/cpt/class-pr-core-peptide-meta-schema.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Returns the complete meta field definition map used by PR_Core_Peptide_CPT
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Meta field schema definitions for the peptide CPT.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *               PR_Core_Verification_Sanitizers.
  *
  * @see cpt/class-pr-core-peptide-cpt.php — Consumer of this schema.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Peptide_Meta_Schema {
 
diff --git a/includes/cpt/class-pr-core-repo-daily-cpt.php b/includes/cpt/class-pr-core-repo-daily-cpt.php
index 4109275..15759c1 100755
--- a/includes/cpt/class-pr-core-repo-daily-cpt.php
+++ b/includes/cpt/class-pr-core-repo-daily-cpt.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Defines the `repo_daily` CPT for articles, guides, comparisons, and news
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Registers the repo_daily custom post type for editorial publications.
  *
@@ -15,7 +21,6 @@ declare(strict_types=1);
  *
  * @see ARCHITECTURE.md — Repo Daily type specification.
  * @see CONVENTIONS.md — CPT ownership and extension patterns.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Repo_Daily_CPT {
 
diff --git a/includes/cpt/class-pr-core-schema-sanitizers.php b/includes/cpt/class-pr-core-schema-sanitizers.php
index cfbea7a..fe9e29c 100644
--- a/includes/cpt/class-pr-core-schema-sanitizers.php
+++ b/includes/cpt/class-pr-core-schema-sanitizers.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Static sanitizer methods for _pr_molecular_formula, _pr_molecular_weight,
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Sanitizers for v0.6.0 schema-input meta fields.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see cpt/class-pr-core-peptide-cpt.php — Meta field registration.
  * @see ARCHITECTURE.md                   — §v0.6.0 schema sprint.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Schema_Sanitizers {
 
diff --git a/includes/cpt/class-pr-core-topic-taxonomy.php b/includes/cpt/class-pr-core-topic-taxonomy.php
index 561909d..e4a2c68 100644
--- a/includes/cpt/class-pr-core-topic-taxonomy.php
+++ b/includes/cpt/class-pr-core-topic-taxonomy.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Defines the `peptide_topic` taxonomy attached to the post CPT
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Registers the peptide_topic taxonomy for linking blog posts to peptides.
  *
@@ -15,7 +21,6 @@ declare(strict_types=1);
  *
  * @see ARCHITECTURE.md — Taxonomy specification.
  * @see CONVENTIONS.md — Taxonomy ownership rule.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Topic_Taxonomy {
 
diff --git a/includes/cpt/class-pr-core-verification-sanitizers.php b/includes/cpt/class-pr-core-verification-sanitizers.php
index 0c41b70..d0277b0 100644
--- a/includes/cpt/class-pr-core-verification-sanitizers.php
+++ b/includes/cpt/class-pr-core-verification-sanitizers.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Standalone sanitization functions for verification_velocity and verification_status fields
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Sanitizers for verification meta fields.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: None.
  *
  * @see cpt/class-pr-core-peptide-cpt.php — Calls these from meta field registration.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Verification_Sanitizers {
 
diff --git a/includes/dto/class-pr-core-candidate-dto.php b/includes/dto/class-pr-core-candidate-dto.php
index dd5fd53..16d66fb 100644
--- a/includes/dto/class-pr-core-candidate-dto.php
+++ b/includes/dto/class-pr-core-candidate-dto.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Immutable value object wrapping a row from pr_ai_candidate_queue
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Typed data-transfer object for an AI candidate queue entry.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0003-candidate-queue.php — Table schema.
  * @see repositories/class-pr-core-candidate-queue-repository.php   — Creates these.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Candidate_DTO {
 
diff --git a/includes/dto/class-pr-core-dosing-row-dto.php b/includes/dto/class-pr-core-dosing-row-dto.php
index 7503b8e..d7a07e3 100644
--- a/includes/dto/class-pr-core-dosing-row-dto.php
+++ b/includes/dto/class-pr-core-dosing-row-dto.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Immutable value object wrapping a row from pr_dosing_rows
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Typed data-transfer object for a dosing row.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0001-dosing-rows.php — Table schema.
  * @see repositories/class-pr-core-dosing-repository.php        — Creates these from DB rows.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Dosing_Row_DTO {
 
diff --git a/includes/dto/class-pr-core-legal-cell-dto.php b/includes/dto/class-pr-core-legal-cell-dto.php
index c3611f5..a148ffb 100644
--- a/includes/dto/class-pr-core-legal-cell-dto.php
+++ b/includes/dto/class-pr-core-legal-cell-dto.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Immutable value object wrapping a row from pr_legal_cells
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Typed data-transfer object for a legal status cell.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0002-legal-cells.php — Table schema.
  * @see repositories/class-pr-core-legal-repository.php         — Creates these from DB rows.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Legal_Cell_DTO {
 
diff --git a/includes/dto/class-pr-core-peptide-dto.php b/includes/dto/class-pr-core-peptide-dto.php
index ff5d201..4f3bbf8 100644
--- a/includes/dto/class-pr-core-peptide-dto.php
+++ b/includes/dto/class-pr-core-peptide-dto.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Immutable value object wrapping a peptide post + its meta fields
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Typed data-transfer object for a peptide record.
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see cpt/class-pr-core-peptide-cpt.php       — Meta field definitions.
  * @see repositories/class-pr-core-peptide-repository.php — Creates these from WP_Post.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Peptide_DTO {
 
diff --git a/includes/frontend/class-pr-core-disclaimer.php b/includes/frontend/class-pr-core-disclaimer.php
index e09fdbe..16ceb70 100644
--- a/includes/frontend/class-pr-core-disclaimer.php
+++ b/includes/frontend/class-pr-core-disclaimer.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Provides shortcode [pr_disclaimer surface="dosing"] and function
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Shared disclaimer component for all peptide data surfaces.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  * not once per consumer plugin.
  *
  * @see ARCHITECTURE.md — Section 2.8 Shared Disclaimer Component.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Disclaimer {
 
diff --git a/includes/frontend/class-pr-core-jsonld-drug.php b/includes/frontend/class-pr-core-jsonld-drug.php
index e30997c..8fd2156 100644
--- a/includes/frontend/class-pr-core-jsonld-drug.php
+++ b/includes/frontend/class-pr-core-jsonld-drug.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Assembles a Drug (+ MolecularEntity) schema node from peptide DTO
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Builds the schema.org Drug graph piece for a peptide page.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see frontend/class-pr-core-jsonld.php — Orchestrator that calls this builder.
  * @see ARCHITECTURE.md                   — §2.7 JSON-LD output.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Jsonld_Drug {
 
diff --git a/includes/frontend/class-pr-core-jsonld-faq.php b/includes/frontend/class-pr-core-jsonld-faq.php
index 4146644..c582026 100644
--- a/includes/frontend/class-pr-core-jsonld-faq.php
+++ b/includes/frontend/class-pr-core-jsonld-faq.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Reads _pr_faq_items post-meta (JSON array of {question, answer} objects)
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Builds the schema.org FAQPage graph piece for a peptide page.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  * @see frontend/class-pr-core-jsonld.php       — Orchestrator that calls this builder.
  * @see cpt/class-pr-core-schema-sanitizers.php — sanitize_faq_items() used on save.
  * @see ARCHITECTURE.md                         — §2.7 JSON-LD output.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Jsonld_Faq {
 
diff --git a/includes/frontend/class-pr-core-jsonld-webpage.php b/includes/frontend/class-pr-core-jsonld-webpage.php
index 93d9af5..4deb47c 100644
--- a/includes/frontend/class-pr-core-jsonld-webpage.php
+++ b/includes/frontend/class-pr-core-jsonld-webpage.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Hooks into Yoast's wpseo_schema_webpage_type filter to retype the page
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Enriches Yoast's WebPage node to MedicalWebPage for peptide single pages.
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  *
  * @see frontend/class-pr-core-jsonld.php — Parent orchestrator.
  * @see ARCHITECTURE.md                   — §2.7 JSON-LD output, Yoast integration contract.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Jsonld_Webpage {
 
diff --git a/includes/frontend/class-pr-core-jsonld.php b/includes/frontend/class-pr-core-jsonld.php
index 67afa93..1790906 100644
--- a/includes/frontend/class-pr-core-jsonld.php
+++ b/includes/frontend/class-pr-core-jsonld.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Integrates Drug, MedicalWebPage, and FAQPage schema into Yoast's graph
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * JSON-LD / schema.org structured data emission for peptide pages.
  *
@@ -32,7 +38,6 @@ declare(strict_types=1);
  * @see frontend/class-pr-core-jsonld-webpage.php — MedicalWebPage enrichment.
  * @see frontend/class-pr-core-jsonld-faq.php     — FAQPage piece builder.
  * @see ARCHITECTURE.md                           — §2.7 JSON-LD output.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Jsonld {
 
diff --git a/includes/frontend/class-pr-core-verification-display.php b/includes/frontend/class-pr-core-verification-display.php
index 703731f..def947f 100644
--- a/includes/frontend/class-pr-core-verification-display.php
+++ b/includes/frontend/class-pr-core-verification-display.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Appends last-verified date after verdict card on reader-facing pages
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Frontend verification date display on peptide single pages.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: None (hooked via the_content).
  *
  * @see includes/class-pr-core.php — Registers the_content hook.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Verification_Display {
 
diff --git a/includes/interfaces/interface-related-posts-provider.php b/includes/interfaces/interface-related-posts-provider.php
index 460b547..f48cabc 100644
--- a/includes/interfaces/interface-related-posts-provider.php
+++ b/includes/interfaces/interface-related-posts-provider.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Defines the contract for retrieving posts related to a given peptide
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Interface for fetching related posts for a peptide.
  *
@@ -8,7 +14,6 @@ declare(strict_types=1);
  * Who calls it: PR_Core_Related_Posts_Section uses implementations to fetch related articles.
  * Dependencies: None.
  *
- * @package Peptide_Repo_Core
  */
 interface PR_Core_Related_Posts_Provider {
 
diff --git a/includes/migrations/class-pr-core-migration-0001-dosing-rows.php b/includes/migrations/class-pr-core-migration-0001-dosing-rows.php
index 782c32b..a3df4e6 100644
--- a/includes/migrations/class-pr-core-migration-0001-dosing-rows.php
+++ b/includes/migrations/class-pr-core-migration-0001-dosing-rows.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Creates the high-cardinality dosing data table (1:many with peptide)
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Migration 0001: Create the pr_dosing_rows table.
  *
@@ -9,7 +15,6 @@ declare(strict_types=1);
  * Dependencies: WordPress $wpdb, dbDelta().
  *
  * @see ARCHITECTURE.md — Table schema specification.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Migration_0001_Dosing_Rows {
 
diff --git a/includes/migrations/class-pr-core-migration-0002-legal-cells.php b/includes/migrations/class-pr-core-migration-0002-legal-cells.php
index 1dd2b56..d8acd81 100644
--- a/includes/migrations/class-pr-core-migration-0002-legal-cells.php
+++ b/includes/migrations/class-pr-core-migration-0002-legal-cells.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Creates the per-country legal status table (1:many with peptide)
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Migration 0002: Create the pr_legal_cells table.
  *
@@ -11,7 +17,6 @@ declare(strict_types=1);
  * Uniqueness: only one active cell per peptide x country (superseded_by_id NULL).
  *
  * @see ARCHITECTURE.md — Table schema specification.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Migration_0002_Legal_Cells {
 
diff --git a/includes/migrations/class-pr-core-migration-0003-candidate-queue.php b/includes/migrations/class-pr-core-migration-0003-candidate-queue.php
index ad7a3f2..f519562 100644
--- a/includes/migrations/class-pr-core-migration-0003-candidate-queue.php
+++ b/includes/migrations/class-pr-core-migration-0003-candidate-queue.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Creates the AI-extracted dosing candidate queue table
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Migration 0003: Create the pr_ai_candidate_queue table.
  *
@@ -12,7 +18,6 @@ declare(strict_types=1);
  * and ai_candidate_id set; queue row marked 'merged'.
  *
  * @see ARCHITECTURE.md — AI-assist candidate-extraction pipeline.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Migration_0003_Candidate_Queue {
 
diff --git a/includes/migrations/class-pr-core-migration-0004-backfill-peptide-meta.php b/includes/migrations/class-pr-core-migration-0004-backfill-peptide-meta.php
index 99d833e..f4896de 100644
--- a/includes/migrations/class-pr-core-migration-0004-backfill-peptide-meta.php
+++ b/includes/migrations/class-pr-core-migration-0004-backfill-peptide-meta.php
@@ -1,4 +1,5 @@
 <?php
+/** @package Peptide_Repo_Core */
 declare(strict_types=1);
 
 /**
@@ -27,7 +28,6 @@ declare(strict_types=1);
  * @see ARCHITECTURE.md     — §v0.6.0 schema sprint.
  * @see CONVENTIONS.md      — How To: Add a New Migration.
  * @see class-pr-core-pubchem-client.php — HTTP client for PubChem REST.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Migration_0004_Backfill_Peptide_Meta {
 
diff --git a/includes/migrations/class-pr-core-migration-runner.php b/includes/migrations/class-pr-core-migration-runner.php
index b264970..9d2c126 100644
--- a/includes/migrations/class-pr-core-migration-runner.php
+++ b/includes/migrations/class-pr-core-migration-runner.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Compares current schema version against target, runs pending migrations
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Schema migration runner.
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  *
  * @see peptide-repo-core.php — Defines PR_CORE_TARGET_SCHEMA_VERSION.
  * @see CONVENTIONS.md        — "How To: Add a New Migration".
- * @package Peptide_Repo_Core
  */
 class PR_Core_Migration_Runner {
 
diff --git a/includes/migrations/class-pr-core-pubchem-client.php b/includes/migrations/class-pr-core-pubchem-client.php
index c0fe0ee..cda19c1 100644
--- a/includes/migrations/class-pr-core-pubchem-client.php
+++ b/includes/migrations/class-pr-core-pubchem-client.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Fetches molecular formula, molecular weight, and synonyms from the
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Lightweight PubChem REST client for the backfill migration.
  *
@@ -17,7 +23,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0004-backfill-peptide-meta.php — Caller.
  * @see ARCHITECTURE.md — §v0.6.0 schema sprint.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Pubchem_Client {
 
diff --git a/includes/repositories/class-pr-core-candidate-queue-repository.php b/includes/repositories/class-pr-core-candidate-queue-repository.php
index 92da29c..b129766 100644
--- a/includes/repositories/class-pr-core-candidate-queue-repository.php
+++ b/includes/repositories/class-pr-core-candidate-queue-repository.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * CRUD for AI-extracted dosing candidates awaiting human review
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Repository for AI candidate queue (pr_ai_candidate_queue table).
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  * @see migrations/class-pr-core-migration-0003-candidate-queue.php — Table schema.
  * @see dto/class-pr-core-candidate-dto.php                         — Return type.
  * @see admin/class-pr-core-candidate-queue-page.php                — Admin UI.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Candidate_Queue_Repository {
 
diff --git a/includes/repositories/class-pr-core-dosing-repository.php b/includes/repositories/class-pr-core-dosing-repository.php
index 1be7986..d1df95e 100644
--- a/includes/repositories/class-pr-core-dosing-repository.php
+++ b/includes/repositories/class-pr-core-dosing-repository.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * CRUD operations for dosing data, returning typed DTOs
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Repository for dosing rows (pr_dosing_rows table).
  *
@@ -10,7 +16,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0001-dosing-rows.php — Table schema.
  * @see dto/class-pr-core-dosing-row-dto.php                    — Return type.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Dosing_Repository {
 
diff --git a/includes/repositories/class-pr-core-legal-repository.php b/includes/repositories/class-pr-core-legal-repository.php
index 422be16..04e9e3a 100644
--- a/includes/repositories/class-pr-core-legal-repository.php
+++ b/includes/repositories/class-pr-core-legal-repository.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * CRUD operations for per-country legal status data, returning typed DTOs
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Repository for legal status cells (pr_legal_cells table).
  *
@@ -13,7 +19,6 @@ declare(strict_types=1);
  *
  * @see migrations/class-pr-core-migration-0002-legal-cells.php — Table schema.
  * @see dto/class-pr-core-legal-cell-dto.php                    — Return type.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Legal_Repository {
 
diff --git a/includes/repositories/class-pr-core-peptide-repository.php b/includes/repositories/class-pr-core-peptide-repository.php
index fc76881..6064db7 100644
--- a/includes/repositories/class-pr-core-peptide-repository.php
+++ b/includes/repositories/class-pr-core-peptide-repository.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * CRUD operations over peptide posts, returning typed DTOs
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Repository for peptide CPT records.
  *
@@ -11,7 +17,6 @@ declare(strict_types=1);
  * @see dto/class-pr-core-peptide-dto.php         — Return type.
  * @see cpt/class-pr-core-peptide-cpt.php         — CPT and meta registration.
  * @see repositories/class-pr-core-dosing-repository.php — Related dosing data.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Peptide_Repository {
 
diff --git a/includes/scanner/class-pr-core-verification-scanner.php b/includes/scanner/class-pr-core-verification-scanner.php
index e0681f4..3152203 100644
--- a/includes/scanner/class-pr-core-verification-scanner.php
+++ b/includes/scanner/class-pr-core-verification-scanner.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Runs periodic scans of all published peptides, computes verification status
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Verification scanner for peptide monographs.
  *
@@ -11,7 +17,6 @@ declare(strict_types=1);
  *
  * @see admin/class-pr-core-settings.php — Cadence and threshold settings.
  * @see cpt/class-pr-core-peptide-cpt.php — Verification meta field specs.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Verification_Scanner {
 
diff --git a/includes/taxonomies/class-pr-core-repo-daily-taxonomy.php b/includes/taxonomies/class-pr-core-repo-daily-taxonomy.php
index 1023597..a3a4b00 100755
--- a/includes/taxonomies/class-pr-core-repo-daily-taxonomy.php
+++ b/includes/taxonomies/class-pr-core-repo-daily-taxonomy.php
@@ -1,6 +1,12 @@
 <?php
 declare(strict_types=1);
 
+/**
+ * Defines the `repo_daily_category` taxonomy attached to repo_daily CPT
+ *
+ * @package Peptide_Repo_Core
+ */
+
 /**
  * Registers the repo_daily_category taxonomy for Repo Daily articles.
  *
@@ -14,7 +20,6 @@ declare(strict_types=1);
  *
  * @see ARCHITECTURE.md — Content type taxonomy specification.
  * @see CONVENTIONS.md — Taxonomy ownership pattern.
- * @package Peptide_Repo_Core
  */
 class PR_Core_Repo_Daily_Taxonomy {
 
diff --git a/peptide-repo-core.php b/peptide-repo-core.php
index b155e95..b3f3963 100644
--- a/peptide-repo-core.php
+++ b/peptide-repo-core.php
@@ -1,4 +1,10 @@
 <?php
+
+/**
+ * Part of the Peptide Repo Core plugin.
+ *
+ * @package Peptide_Repo_Core
+ */
 /**
  * Plugin Name: Peptide Repo Core
  * Plugin URI:  https://peptiderepo.com
diff --git a/template-parts/related-posts/card.php b/template-parts/related-posts/card.php
index 10c1099..7ed190b 100644
--- a/template-parts/related-posts/card.php
+++ b/template-parts/related-posts/card.php
@@ -1,4 +1,10 @@
 <?php
+
+/**
+ * Part of the Peptide Repo Core plugin.
+ *
+ * @package Peptide_Repo_Core
+ */
 /**
  * Related posts card template part.
  *