docs(plan): record signal gap completion and next up

docs/plans/2026-02-16-signal-channel-adapter-checklist.md

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+# Signal Channel Adapter Checklist
+
+Date: 2026-02-16
+Status: completed
+
+## Scope
+
+- Add a first-class Signal channel adapter using `signal-cli`.
+- Support direct-message and group routing with existing channel policy semantics.
+
+## Completed
+
+- Added `SignalAdapter` in `src/channels/signal/adapter.ts`:
+  - process-backed integration via `signal-cli`
+  - outbound send for direct peers and groups (`group:<id>` convention)
+  - inbound polling loop with JSON parsing for `receive` output
+  - allowlist gating for DMs/groups + optional DM pairing flow
+  - group mention gating with configurable `mention_name`
+- Registered channel exports:
+  - `src/channels/signal/index.ts`
+  - `src/channels/index.ts`
+- Added config schema support in `src/config/schema.ts`:
+  - `signal.account`
+  - `signal.signal_cli_path`
+  - `signal.allowed_numbers`
+  - `signal.allowed_group_ids`
+  - `signal.require_mention`
+  - `signal.mention_name`
+  - `signal.poll_interval_ms`
+  - `signal.send_timeout_ms`
+- Wired daemon registration in `src/daemon/channels.ts`.
+- Extended gateway service discovery in `src/gateway/handlers/services.ts`.
+- Updated docs:
+  - `README.md` channel/config docs
+  - `config/default.yaml` template block for Signal
+- Added tests:
+  - `src/channels/signal/adapter.test.ts`
+  - `src/config/schema.test.ts` signal coverage
+  - `src/gateway/handlers/services.test.ts` signal service coverage
+
+## Verification
+
+- `pnpm test:run src/channels/signal/adapter.test.ts src/config/schema.test.ts src/gateway/handlers/services.test.ts`
+- `pnpm typecheck`