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-cron.php

@@ -0,0 +1,82 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * WP-Cron management for the weekly AI-visibility probe.
+ *
+ * Registers the prv_weekly_probe hook, schedules/clears the event, and
+ * dispatches to PRV_Probe_Runner on each tick.
+ *
+ * Who triggers: PRV_Plugin::init() (hook registration), PRV_Activator
+ *               (schedule), PRV_Deactivator (clear).
+ * Dependencies: PRV_Probe_Runner.
+ *
+ * @see class-prv-probe-runner.php — Runner invoked on each cron tick.
+ * @see class-prv-activator.php    — Calls schedule_weekly() on activation.
+ * @package PrVision
+ */
+class PRV_Cron {
+
+	/**
+	 * Register WordPress action hooks.
+	 *
+	 * Side effects: Adds action for PRV_CRON_HOOK.
+	 *
+	 * @return void
+	 */
+	public function register_hooks(): void {
+		add_action( PRV_CRON_HOOK, array( $this, 'handle_cron_tick' ) );
+	}
+
+	/**
+	 * Callback fired by WP-Cron on the weekly schedule.
+	 *
+	 * Side effects: Instantiates and runs PRV_Probe_Runner.
+	 *
+	 * @return void
+	 */
+	public function handle_cron_tick(): void {
+		$runner = new PRV_Probe_Runner();
+		$runner->run();
+	}
+
+	/**
+	 * Schedule the weekly cron event if not already scheduled.
+	 *
+	 * Safe to call on re-activation — no-op when already scheduled.
+	 *
+	 * Side effects: Adds a WP-Cron event.
+	 *
+	 * @return void
+	 */
+	public static function schedule_weekly(): void {
+		if ( ! wp_next_scheduled( PRV_CRON_HOOK ) ) {
+			wp_schedule_event( time(), 'weekly', PRV_CRON_HOOK );
+		}
+	}
+
+	/**
+	 * Remove the weekly cron schedule.
+	 *
+	 * Called on deactivation. Does not purge data.
+	 *
+	 * Side effects: Removes the WP-Cron event.
+	 *
+	 * @return void
+	 */
+	public static function clear_schedule(): void {
+		$timestamp = wp_next_scheduled( PRV_CRON_HOOK );
+		if ( false !== $timestamp ) {
+			wp_unschedule_event( $timestamp, PRV_CRON_HOOK );
+		}
+	}
+
+	/**
+	 * Check whether the weekly event is currently scheduled.
+	 *
+	 * @return bool
+	 */
+	public static function is_scheduled(): bool {
+		return false !== wp_next_scheduled( PRV_CRON_HOOK );
+	}
+}