fix(maintenance): v0.19.4 — composer GD-rung tests, layout-key cleanup, carried P3s

Items completed:
1. GD-rung tests (QA P2, verdict 2026-06-11-6f76df1.md P2-1):
   - New ImageComposerEditorTest.php: 7 tests covering wp_get_image_editor WP_Error,
     resize WP_Error, upscale size-mismatch guard, save WP_Error, zero-width geometry
     guard, missing-role guard, and successful OG resize happy path.
   - Orchestrator gd-rung test added to ImageComposerTest.php: forces capability='gd'
     via filter, asserts Imagick renderer is never called, pass-through featured is
     always first.

2. Dead layout keys removed (QA P3, same verdict P3-3):
   - Removed caption_margin_right (og) and caption_side_padding (square) from
     Layout::defaults(). The Imagick renderer never reads them: og text is
     left-anchored from logo_x+logo_w+caption_gap; square text is center-anchored
     at floor(width/2). Right-edge geometry is enforced by caption_chars_per_line.
     Decision: remove (not consume) — no renderer geometry to wire them to.

3. Amortized pv/role (P3 carried, phase-1 thread seq 49 + seq 50):
   - Post_Assembler::amortize_research_costs() SELECT now includes prompt_version
     and agent_role; INSERT carries them forward so amortized llm_research rows are
     no longer stamped with NULL/empty audit fields.

4. fetch_page() error body (P3 carried, phase-1 thread seq 50):
   - Runware_Catalog_Fetcher::fetch_page() non-200 exceptions now include up to
     200 chars of the response body for log-based diagnosis.

5. cto-review.yml isinstance guard: ALREADY FIXED at HEAD (line 454 uses
   c.get("severity", "UNKNOWN")). Noted in CHANGELOG; no code change.

Agent-Session: engineer-prab-maint-20260612

prautoblogger.php

@@ -9,7 +9,7 @@
  * Plugin Name:       PRAutoBlogger
  * Plugin URI:        https://peptiderepo.com/prautoblogger
  * Description:       Monitors social media for trending topics, generates SEO-friendly blog posts using AI, and publishes them on a daily schedule with full cost tracking and self-improvement metrics.
- * Version:           0.19.3
+ * Version:           0.19.4
  * Requires at least: 6.0
  * Requires PHP:      7.4
  * Author:            PeptideRepo
@@ -35,7 +35,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 | Defined here so every file in the plugin can reference paths, versions,
 | and limits without magic strings.
 */
-define( 'PRAUTOBLOGGER_VERSION', '0.19.3' );
+define( 'PRAUTOBLOGGER_VERSION', '0.19.4' );
 define( 'PRAUTOBLOGGER_DB_VERSION', '1.1.0' );
 define( 'PRAUTOBLOGGER_PLUGIN_FILE', __FILE__ );
 define( 'PRAUTOBLOGGER_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );