feat: add matrix channel plugin

docs/channels/index.md

@@ -18,6 +18,7 @@ Text is supported everywhere; media and reactions vary by channel.
 - [Signal](/channels/signal) — signal-cli; privacy-focused.
 - [iMessage](/channels/imessage) — macOS only; native integration.
 - [Microsoft Teams](/channels/msteams) — Bot Framework; enterprise support.
+- [Matrix](/channels/matrix) — Matrix protocol (plugin, installed separately).
 - [Zalo](/channels/zalo) — Zalo Bot API; Vietnam's popular messenger (plugin, installed separately).
 - [WebChat](/web/webchat) — Gateway WebChat UI over WebSocket.
 

docs/channels/matrix.md

@@ -0,0 +1,116 @@
+---
+summary: "Matrix support status, capabilities, and configuration"
+read_when:
+  - Working on Matrix channel features
+---
+# Matrix (plugin)
+
+Status: supported via plugin (matrix-js-sdk). Direct messages, rooms, threads, media, reactions, and polls.
+
+## Plugin required
+Matrix ships as a plugin and is not bundled with the core install.
+- Install via CLI: `clawdbot plugins install @clawdbot/matrix`
+- Or select **Matrix** during onboarding and confirm the install prompt
+- Details: [Plugins](/plugin)
+
+## Quick setup (beginner)
+1) Install the Matrix plugin:
+   - From a source checkout: `clawdbot plugins install ./extensions/matrix`
+   - From npm (if published): `clawdbot plugins install @clawdbot/matrix`
+   - Or pick **Matrix** in onboarding and confirm the install prompt
+2) Configure credentials:
+   - Env: `MATRIX_HOMESERVER`, `MATRIX_USER_ID`, `MATRIX_ACCESS_TOKEN` (or `MATRIX_PASSWORD`)
+   - Or config: `channels.matrix.*`
+3) Restart the gateway (or finish onboarding).
+4) DM access defaults to pairing; approve the pairing code on first contact.
+
+Runtime note: Matrix requires Node.js (Bun is not supported).
+
+Minimal config:
+```json5
+{
+  channels: {
+    matrix: {
+      enabled: true,
+      homeserver: "https://matrix.example.org",
+      userId: "@clawdbot:example.org",
+      accessToken: "syt_***",
+      dm: { policy: "pairing" }
+    }
+  }
+}
+```
+
+## Encryption (E2EE)
+End-to-end encrypted rooms are **not** supported.
+- Use unencrypted rooms or disable encryption when creating the room.
+- If a room is E2EE, the bot will receive encrypted events and won’t reply.
+
+## What it is
+Matrix is an open messaging protocol. Clawdbot connects as a Matrix user and listens to DMs and rooms.
+- A Matrix user account owned by the Gateway.
+- Deterministic routing: replies go back to Matrix.
+- DMs share the agent's main session; rooms map to group sessions.
+
+## Access control (DMs)
+- Default: `channels.matrix.dm.policy = "pairing"`. Unknown senders get a pairing code.
+- Approve via:
+  - `clawdbot pairing list matrix`
+  - `clawdbot pairing approve matrix <CODE>`
+- Public DMs: `channels.matrix.dm.policy="open"` plus `channels.matrix.dm.allowFrom=["*"]`.
+
+## Rooms (groups)
+- Default: `channels.matrix.groupPolicy = "allowlist"` (mention-gated).
+- Allowlist rooms with `channels.matrix.rooms`:
+```json5
+{
+  channels: {
+    matrix: {
+      rooms: {
+        "!roomId:example.org": { requireMention: true }
+      }
+    }
+  }
+}
+```
+- `requireMention: false` enables auto-reply in that room.
+
+## Threads
+- Reply threading is supported.
+- `channels.matrix.replyToMode` controls replies when tagged:
+  - `off` (default), `first`, `all`
+
+## Capabilities
+| Feature | Status |
+|---------|--------|
+| Direct messages | ✅ Supported |
+| Rooms | ✅ Supported |
+| Threads | ✅ Supported |
+| Media | ✅ Supported |
+| Reactions | ✅ Supported |
+| Polls | ✅ Supported |
+| Native commands | ✅ Supported |
+
+## Configuration reference (Matrix)
+Full configuration: [Configuration](/gateway/configuration)
+
+Provider options:
+- `channels.matrix.enabled`: enable/disable channel startup.
+- `channels.matrix.homeserver`: homeserver URL.
+- `channels.matrix.userId`: Matrix user ID.
+- `channels.matrix.accessToken`: access token.
+- `channels.matrix.password`: password for login (token stored).
+- `channels.matrix.deviceName`: device display name.
+- `channels.matrix.initialSyncLimit`: initial sync limit.
+- `channels.matrix.threadReplies`: `off | inbound | always` (default: inbound).
+- `channels.matrix.textChunkLimit`: outbound text chunk size (chars).
+- `channels.matrix.dm.policy`: `pairing | allowlist | open | disabled` (default: pairing).
+- `channels.matrix.dm.allowFrom`: DM allowlist. `open` requires `"*"`.
+- `channels.matrix.groupPolicy`: `allowlist | open | disabled` (default: allowlist).
+- `channels.matrix.allowlistOnly`: force allowlist rules for DMs + rooms.
+- `channels.matrix.rooms`: per-room settings and allowlist.
+- `channels.matrix.replyToMode`: reply-to mode for threads/tags.
+- `channels.matrix.mediaMaxMb`: inbound/outbound media cap (MB).
+- `channels.matrix.autoJoin`: invite handling (`always | allowlist | off`, default: always).
+- `channels.matrix.autoJoinAllowlist`: allowed room IDs/aliases for auto-join.
+- `channels.matrix.actions`: per-action tool gating (reactions/messages/pins/memberInfo/channelInfo).

docs/docs.json

@@ -905,6 +905,7 @@
           "channels/signal",
           "channels/imessage",
           "channels/msteams",
+          "channels/matrix",
           "channels/zalo",
           "broadcast-groups",
           "channels/troubleshooting",