PR Vision v0.3.0: per-call cost accountability + LLM call audit trail

P0 security:
- PRV_Gateway_Client: remove response body from RuntimeException (HTTP status only)
- PRV_Capture_Writer: allowlist-only write (prompt/response text, never headers/auth)
- Mandatory capture order: can_afford → probe → persist_result → update_row_cost → write_meta → capture_io
- capture_io last and wrapped in swallowing try/catch

New tables (SCHEMA_VERSION 3):
- prv_call_meta: cost/metadata per call, kept indefinitely
- prv_call_io: rendered prompt + raw response, pruned on retention window (default 90d)

New classes:
- PRV_Call_Meta_Table, PRV_Call_Io_Table: table schema + dbDelta
- PRV_Capture_Writer: metadata + I/O write; security allowlist enforced
- PRV_Prune_Cron: daily prv_daily_prune cron deletes aged prv_call_io rows only
- PRV_Cost_Rollup_Query: MTD summary, model breakdown, drill-down, projection
- PRV_Call_Log_Query: paginated + filtered call-log query + per-call I/O fetch
- PRV_Costs_Page + PRV_Costs_Renderer: Costs admin sub-page (cap progress, bento, model table, drill-down)
- PRV_Call_Log_Page + PRV_Call_Log_Table_Renderer: Call Log admin sub-page (filter bar, paginated table, WCAG AA pagination)
- PRV_Call_Drawer_Renderer: non-modal complementary drawer (5 states: Normal/Pruned/Legacy/Failed/Loading)
- PRV_Call_Drawer_Script: inline JS for drawer (300-line split from renderer)
- PRV_Call_Detail_Ajax: wp_ajax_prv_call_detail AJAX handler
- PRV_Admin_Page_Css: CSS provider (300-line split from PRV_Admin_Page)
- PRV_Probe_Run_Executor: inner probe loop (300-line split from PRV_Probe_Runner)

Updated:
- PRV_Probe_Result: tokens_in/tokens_out params + getters
- Both providers: report tokens_in/tokens_out from usage.prompt_tokens/completion_tokens
- PRV_Probe_Runner: slimmed to lock+UUID+delegation; injects PRV_Capture_Writer
- PRV_Config: get_io_retention_days(); PRV_IO_RETENTION_DEFAULT_DAYS constant
- PRV_Upgrader/Activator/Deactivator/Plugin: register new tables, cron, pages, AJAX
- Settings: retention days field + save in controller
- uninstall.php: DROP both new tables, clear prv_daily_prune cron
- Subnav 4-tab strip (Dashboard | Costs | Call Log | Settings) on all pages
- ARCHITECTURE.md, CHANGELOG.md, CONTEXT.md, CONVENTIONS.md updated

Tests:
- test-capture-writer.php: write_meta, write_io, P0 security (401 record has no key/Bearer/sk-or-)
- test-cost-audit.php: MTD reconciliation, projection, prune, forced capture_io exception, table drops

Agent-Session: peptiderepo-geomonitor-v0.3.0-cost-audit

includes/core/class-prv-plugin.php

@@ -16,10 +16,14 @@ declare(strict_types=1);
  *
  * Who triggers: plugins_loaded action (pr-vision.php).
  * Dependencies: PRV_Upgrader, PRV_Cron, PRV_Admin_Page, PRV_Settings_Page,
- *               PRV_Collector_Registry.
+ *               PRV_Settings_Controller, PRV_Costs_Page, PRV_Call_Log_Page,
+ *               PRV_Call_Detail_Ajax, PRV_Prune_Cron, PRV_Collector_Registry.
  *
- * @see ARCHITECTURE.md  -- Boot sequence diagram.
- * @see class-prv-upgrader.php -- Runs migrations on every boot.
+ * @see ARCHITECTURE.md             -- Boot sequence diagram.
+ * @see class-prv-upgrader.php      -- Runs migrations on every boot.
+ * @see class-prv-costs-page.php    -- [v0.3.0] Costs admin sub-page.
+ * @see class-prv-call-log-page.php -- [v0.3.0] Call Log admin sub-page.
+ * @see class-prv-prune-cron.php    -- [v0.3.0] Daily prune cron.
  * @package PrVision
  */
 class PRV_Plugin {
@@ -43,12 +47,24 @@ class PRV_Plugin {
 		$cron = new PRV_Cron();
 		$cron->register_hooks();
 
+		$prune = new PRV_Prune_Cron();
+		$prune->register_hooks();
+
 		if ( is_admin() ) {
 			$page = new PRV_Admin_Page();
 			$page->register_hooks();
 
 			$settings = new PRV_Settings_Page();
 			$settings->register_hooks();
+
+			$costs = new PRV_Costs_Page();
+			$costs->register_hooks();
+
+			$call_log = new PRV_Call_Log_Page();
+			$call_log->register_hooks();
+
+			$ajax = new PRV_Call_Detail_Ajax();
+			$ajax->register_hooks();
 		}
 
 		// Register the v1 AI-visibility collector + panel.