feat(gateway): add sender presence tracking

docs/plans/state.json

@@ -203,6 +203,26 @@
       ],
       "test_status": "pnpm test:run src/channels/registry.test.ts src/automation/cron.test.ts src/automation/webhooks.test.ts src/config/schema.test.ts + pnpm typecheck passing"
     },
+    "presence-tracking": {
+      "file": "2026-02-16-presence-tracking-checklist.md",
+      "status": "completed",
+      "date": "2026-02-16",
+      "updated": "2026-02-16",
+      "summary": "Implemented sender presence tracking (online/offline inferred from recent activity) in ChannelRegistry and exposed it via new gateway method `system.presence` for operations visibility.",
+      "files_created": [
+        "docs/plans/2026-02-16-presence-tracking-checklist.md"
+      ],
+      "files_modified": [
+        "src/channels/registry.ts",
+        "src/channels/registry.test.ts",
+        "src/gateway/handlers/system.ts",
+        "src/gateway/handlers/handlers.test.ts",
+        "src/gateway/server.ts",
+        "README.md",
+        "docs/api/PROTOCOL.md"
+      ],
+      "test_status": "pnpm test:run src/channels/registry.test.ts src/gateway/handlers/handlers.test.ts + pnpm typecheck passing"
+    },
     "skill-safety-scanner": {
       "file": "2026-02-15-skill-safety-scanner-checklist.md",
       "status": "completed",
@@ -2232,7 +2252,7 @@
   },
 
   "overall_progress": {
-    "total_test_count": 1698,
+    "total_test_count": 1703,
     "all_tests_passing": true,
     "p0_completion": "3/3 (100%)",
     "p1_completion": "4/4 (100%)",
@@ -2247,12 +2267,12 @@
     "tier2_completion": "4/4 (100%) — inbound webhooks, vector memory search, Dockerfile, heartbeat monitor",
     "tier3_completion": "5/5 (100%) — lane queue, credential redaction, web UI token dashboard, xAI (Grok) provider, Voyage AI embeddings",
     "tier4_completion": "4/4 (100%) — gateway lock, shell completion, Tailscale Serve/Funnel, DM pairing codes",
-    "feature_gap_scorecard": "106/128 match (83%), 0 partial (0%), 22 missing (17%)",
+    "feature_gap_scorecard": "107/128 match (84%), 0 partial (0%), 21 missing (16%)",
     "operator_dx_milestone": "Phase 3 (Live Ops Dashboard): 2/2 plans complete — milestone done",
     "gmail_auth_cli": "flynn gmail-auth command implemented with OAuth2 flow, doctor check, config routed to Telegram",
     "native_audio_support": "completed — smart routing for native audio (Gemini/OpenAI/GitHub) vs Whisper transcription fallback",
     "remaining_phases_completion": "Phase 1: 3/3 (100%) — context levels, command registry, memory structure. Phase 2: 3/3 (100%) — component registry, confidence routing, history index. Phase 3: 2/2 (100%) — adaptive memory/compaction, truthfulness/autonomy hardening",
-    "next_up": "Pick the next OpenClaw gap milestone and create a scoped checklist (candidates: presence tracking, QMD backend, ClawHub registry)"
+    "next_up": "Pick the next OpenClaw gap milestone and create a scoped checklist (candidates: QMD backend, ClawHub registry, Bonjour/mDNS discovery)"
   },
   "soul_md_and_cron_create": {
     "date": "2026-02-11",