peptide-geo-monitor v0.1.0: internal AI-visibility dashboard (#1)

New internal plugin: weekly LLM probes of core peptides (Perplexity sonar + GPT/Gemini-search via OpenRouter/CF gateway) -> custom table -> wp-admin trendline + standings. Provider interface + cost ledger w/ hard $5/mo cap + collector/panel seam (AI-visibility only). v1 = AI-visibility only.

QA: APPROVE-WITH-P2-NOTES — qa-reviews/peptide-geo-monitor/2026-06-13-f488f4a966cbb9e771d3abc20daee3fa49074520.md (P2 follow-ups: ltrim www display bug, PHPCS mandatory, dead cache)

Agent-Session: geomonitor v0.1.0 merge

includes/collector/interface-pgm-data-collector.php

@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Seam: contract for all GEO-monitor data collectors.
+ *
+ * v1 implements only PGM_Ai_Visibility_Collector. Future collectors
+ * (keyword rankings, schema coverage, technical-SEO) implement this
+ * interface and register themselves with PGM_Collector_Registry without
+ * changing the dashboard shell.
+ *
+ * Who triggers: PGM_Collector_Registry dispatches registered collectors.
+ * Dependencies: None — pure interface.
+ *
+ * @see class-pgm-ai-visibility-collector.php — v1 implementation.
+ * @see class-pgm-collector-registry.php      — Registration hub.
+ * @see ARCHITECTURE.md                       — §Collector/Panel seam.
+ * @package PeptideGeoMonitor
+ */
+interface PGM_Data_Collector {
+
+	/**
+	 * Collect and return the data payload for this category.
+	 *
+	 * The return shape is collector-specific; the dashboard panel for this
+	 * category receives the same array and is responsible for rendering it.
+	 *
+	 * @return array<string, mixed> Collected data.
+	 */
+	public function collect(): array;
+
+	/**
+	 * Short machine key identifying this collector (e.g. "ai_visibility").
+	 *
+	 * Used as the registry key and as the panel lookup key.
+	 *
+	 * @return string
+	 */
+	public function get_key(): string;
+}