PR Vision v0.2.0: admin/settings interface + correctness fixes

Requirements 1-8 + all non-negotiables:

1. Model manager (CRUD): PRV_Model_Registry, prv_models v2 option, versioned
   idempotent migration from v0.1.x flat-string format, Settings page CRUD.

2. Per-model run-health: PRV_Model_Registry::update_health() after each run;
   health badges (Healthy/Retired?/Disabled/Unknown) in model table + dashboard.

3. Metric comparability: PRV_Config_Version stamps every run with config_version;
   save-bar warning on scoring-relevant changes; orphaned rows excluded by version.

4. Projected cost at save: PRV_Config::get_projected_cost(); over-cap warning;
   prv_last_run_truncated option + visible notice when cap hit mid-run.

5. Config surface: peptide set, intents, cadence (reschedules cron), budget cap;
   all validated + sanitized; next-run timestamp shown.

6. API-key three-state: not-defined / defined-ok / defined-failed; derived from
   ledger; never displays the key.

7. Run-lock: PRV_Run_Lock (transient); cron tick skips if locked; Run-now
   refuses with clear message; lock released in finally block.

8. Design fixes: dark-ink focus ring on bright fills; disabled-row full AA
   contrast (no opacity); toggle disabled on retired rows; save-bar-level
   warning (role=alert); chip text #B4BDC7 6.83:1 AA; keyboard-sortable headers
   (<button>+aria-sort); aria-live on Test chip; z-index:50 save-bar;
   run-now double-fire guard; @media print light overrides.

New: PRV_Upgrader (runs migrations on plugins_loaded, not just activation),
PRV_Config_Version, PRV_Run_Lock, PRV_Settings_Page, PRV_Settings_Renderer,
PRV_Model_Manager_Table, PRV_Model_Test_Ajax.

Tests: test-model-registry, test-run-lock, test-config-version,
       test-projected-cost, test-cron-reschedule (+ updated probe-runner,
       uninstall, bootstrap).

Schema: config_version INT column added via dbDelta (idempotent).
Uninstall: purges all v0.2 prv_* options + transients.

uninstall.php

@@ -1,13 +1,18 @@
 <?php
 /**
- * PR Vision — full data teardown on uninstall.
+ * PR Vision -- full data teardown on uninstall.
  *
  * Drops the custom prv_ai_visibility table and deletes every wp_options
  * row whose name starts with "prv_". WP-Cron events are already cleared
  * by PRV_Deactivator on deactivation; this runs after that.
  *
- * @see ARCHITECTURE.md — §Uninstall specification.
- * @see class-prv-deactivator.php — Clears cron on deactivation.
+ * v0.2.0 additions: prv_models_schema_version, prv_config_versions,
+ * prv_active_config_version, prv_api_key_status, prv_api_key_last_check,
+ * prv_last_run_at, prv_last_run_counts, prv_last_run_truncated,
+ * prv_last_run_truncated_at -- all purged by the prv_ wildcard DELETE below.
+ *
+ * @see ARCHITECTURE.md     -- Section Uninstall specification.
+ * @see class-prv-deactivator.php -- Clears cron on deactivation.
  * @package PrVision
  */
 
@@ -23,13 +28,20 @@ $table = $wpdb->prefix . 'prv_ai_visibility';
 // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.SchemaChange, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.NoCaching
 $wpdb->query( "DROP TABLE IF EXISTS {$table}" );
 
-/* ── 2. Delete all prv_ prefixed options ──────────────────────────── */
+/* ── 2. Delete all prv_ prefixed options (covers v0.1 + v0.2 keys) ── */
 
 // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
 $wpdb->query(
 	"DELETE FROM {$wpdb->options} WHERE option_name LIKE 'prv\_%'"
 );
 
-/* ── 3. Clear any remaining scheduled cron events ─────────────────── */
+/* ── 3. Delete prv_ transients ────────────────────────────────────── */
+
+// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
+$wpdb->query(
+	"DELETE FROM {$wpdb->options} WHERE option_name LIKE '_transient_prv\_%' OR option_name LIKE '_transient_timeout_prv\_%'"
+);
+
+/* ── 4. Clear any remaining scheduled cron events ─────────────────── */
 
 wp_clear_scheduled_hook( 'prv_weekly_probe' );