fix(maintenance): v0.18.2 — four confirmed-live fixes

1. Cost-reporter SQL: phpcs:ignore annotations were embedded inside two SQL
   string literals (get_daily_spend, get_spend_by_stage), causing MariaDB to
   reject both queries and break the Metrics & Costs admin page. Moved annotations
   above the prepare() calls. Regression tests added to CostReporterTest.

2. Collector failure observability: catch block in collect_from_all_sources() now
   logs structured meta (model slug, HTTP status parsed from exception message,
   first 200 chars of error body) so outage incidents are diagnosable post-hoc.

3. run_stages.agent_role back-write: Pipeline_Runner, Article_Worker, and
   Content_Generator were calling Run_Stage_State::start() with agent_role=''.
   All start() call sites now pass Stage_Display_Map::default_agent_role(stage).
   Role written at INSERT only; ON DUPLICATE KEY UPDATE does not include
   agent_role — idempotency-key semantics on resume are unchanged.

4. Runware float deprecation: normalize_seed() applied % to a float
   (microtime(true) * 1000), triggering PHP 8 deprecation on every image
   generation. Fixed with (int) round(...) before the modulo operator.

Refs: convo/prautoblogger/threads/2026-06-pipeline-v2-phase1/25-cto-v0182-maintenance.md
Agent-Session: prab-v0182-maintenance-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:           0.18.1
+ * Version:           0.18.2
  * 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', '0.18.1' );
+define( 'PRAUTOBLOGGER_VERSION', '0.18.2' );
 define( 'PRAUTOBLOGGER_DB_VERSION', '1.2.0' );
 define( 'PRAUTOBLOGGER_PLUGIN_FILE', __FILE__ );
 define( 'PRAUTOBLOGGER_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );