PR Vision v0.1.1: rename from peptide-geo-monitor + P2 fixes

- Exhaustive rename: PGM_ -> PRV_, pgm_ -> prv_, text domain and
  slug peptide-geo-monitor -> pr-vision, admin menu GEO Monitor ->
  PR Vision, main file peptide-geo-monitor.php -> pr-vision.php,
  DB table pgm_ai_visibility -> prv_ai_visibility.
- P2-A: replace ltrim($host,'www.') character-mask with
  str_starts_with/substr prefix strip in PRV_Citation_Detector.
  Adds test coverage for wikipedia.org, webmd.com survival.
- P2-B: drop continue-on-error: true from PHPCS CI step;
  WordPress Coding Standards now gates the build.
- P2-C: remove dead in-run cache from PRV_Probe_Runner::run();
  each (peptide, intent, model) triplet is visited once per run,
  cache hit is structurally impossible.
- Version bump 0.1.0 -> 0.1.1 + CHANGELOG [0.1.1] entry.

Agent-Session: pr-vision rename v0.1.1

includes/core/class-prv-deactivator.php

@@ -0,0 +1,29 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Plugin deactivation handler.
+ *
+ * Clears the scheduled WP-Cron event so probes stop running when the plugin
+ * is deactivated. Does NOT purge data — that is uninstall's job.
+ *
+ * Who triggers: register_deactivation_hook() in pr-vision.php.
+ * Dependencies: PRV_Cron.
+ *
+ * @see class-prv-cron.php      — Cron registration + clearing.
+ * @see uninstall.php           — Full data purge on uninstall.
+ * @package PrVision
+ */
+class PRV_Deactivator {
+
+	/**
+	 * Clear the weekly cron schedule.
+	 *
+	 * Side effects: Removes the prv_weekly_probe event from WP-Cron.
+	 *
+	 * @return void
+	 */
+	public static function deactivate(): void {
+		PRV_Cron::clear_schedule();
+	}
+}