feat(gateway): complete openclaw phase1 queue parity v2

docs/api/PROTOCOL.md

@@ -33,6 +33,8 @@ The gateway serialises agent work **per session**, not per WebSocket connection:
 
 - Requests that target the same `sessionId` run one-at-a-time (FIFO) in a per-session lane.
 - Requests for different sessions can run in parallel.
+- Lane policy is configurable (`collect`, `followup`, `steer_backlog`, `interrupt`) with per-channel and per-session overrides.
+- Session-local overrides can be managed at runtime via `agent.send` commands: `/queue`, `/queue set ...`, `/queue reset`.
 
 This is implemented via a per-lane queue (`LaneQueue`) in the gateway server, and used by `agent.send` and `agent.cancel`.
 
@@ -555,6 +557,8 @@ Send a message to the agent and stream response.
 }
 ```
 
+When queue policy rejects/supersedes a request before execution, the server emits an `error` event with `code: 3` (`AgentBusy`) and includes `data.queue` metadata (`code`, `laneId`, `mode`, `overflow`, `droppedCount`).
+
 #### `agent.cancel`
 
 Cancel the current agent operation.
@@ -876,11 +880,20 @@ Error occurred during processing.
   "event": "error",
   "data": {
     "code": 5,
-    "message": "Internal error: ..."
+    "message": "Internal error: ...",
+    "queue": {
+      "code": "overflow",
+      "laneId": "ws:abc123",
+      "mode": "followup",
+      "overflow": "drop_new",
+      "droppedCount": 1
+    }
   }
 }
 ```
 
+`data.queue` is optional and only present for queue policy rejections/superseded requests.
+
 ## Error Codes
 
 | Code | Name | Description |

docs/plans/state.json

@@ -33,12 +33,39 @@
       "test_status": "pnpm test:run src/gateway/lane-queue.test.ts src/gateway/handlers/agent.test.ts src/config/schema.test.ts + pnpm typecheck passing"
     },
     "openclaw-gap-next-steps-3phase": {
-      "status": "planned",
+      "status": "in_progress",
       "date": "2026-02-16",
       "updated": "2026-02-16",
-      "summary": "Defined a concrete 3-phase implementation plan for remaining high-impact OpenClaw parity work: queue policy parity v2, channel reach expansion (Mattermost first), and companion-node capability negotiation foundation.",
+      "summary": "Defined and began executing a concrete 3-phase implementation plan for remaining high-impact OpenClaw parity work: queue policy parity v2, channel reach expansion (Mattermost first), and companion-node capability negotiation foundation.",
       "file": "2026-02-16-openclaw-gap-next-steps-3phase.md"
     },
+    "openclaw-gap-phase1-queue-parity-v2": {
+      "status": "completed",
+      "date": "2026-02-16",
+      "updated": "2026-02-16",
+      "summary": "Completed queue parity v2: added followup/steer_backlog semantics, lane debounce, overflow summarization metadata, runtime session queue controls (`/queue` show/set/reset), queue config patch keys, and docs/protocol updates.",
+      "files_modified": [
+        "src/gateway/lane-queue.ts",
+        "src/gateway/lane-queue.test.ts",
+        "src/gateway/handlers/agent.ts",
+        "src/gateway/handlers/agent.test.ts",
+        "src/gateway/server.ts",
+        "src/gateway/protocol.ts",
+        "src/gateway/handlers/config.ts",
+        "src/gateway/handlers/handlers.test.ts",
+        "src/commands/types.ts",
+        "src/commands/builtin/index.ts",
+        "src/commands/builtin/index.test.ts",
+        "src/commands/index.ts",
+        "src/config/schema.ts",
+        "src/config/schema.test.ts",
+        "src/daemon/services.ts",
+        "config/default.yaml",
+        "README.md",
+        "docs/api/PROTOCOL.md"
+      ],
+      "test_status": "pnpm test:run src/gateway/lane-queue.test.ts src/gateway/handlers/agent.test.ts src/gateway/handlers/handlers.test.ts src/commands/builtin/index.test.ts src/config/schema.test.ts + pnpm typecheck + pnpm build passing"
+    },
     "docs-gateway-auth-config-keys": {
       "status": "completed",
       "date": "2026-02-15",
@@ -2962,12 +2989,12 @@
     "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": "115/128 match (90%), 0 partial (0%), 13 missing (10%)",
+    "feature_gap_scorecard": "116/128 match (91%), 0 partial (0%), 12 missing (9%)",
     "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": "OpenClaw gap: Location access (open next scoped implementation checklist)"
+    "next_up": "OpenClaw gap phase 2: Mattermost channel adapter + wiring/docs/tests"
   },
   "soul_md_and_cron_create": {
     "date": "2026-02-11",