Add Matrix Channel

Adds Matrix support via the Chat SDK bridge. NanoClaw doesn't ship channels in trunk, this skill copies the Matrix adapter in from the channels branch.

The mechanical steps under Apply carry nc: directive fences: an agent reads the prose and applies them, and a parser can apply them deterministically from the same document. Every directive is idempotent, so the whole skill is safe to re-run; anything a parser can't apply falls back to the prose beside it.

Apply

1. Copy the adapter

Fetch the channels branch and copy the Matrix adapter into src/channels/ (overwrite, the branch is canonical):

src/channels/matrix.ts
src/channels/matrix-registration.test.ts

2. Register the adapter

Append the self-registration import to the channel barrel (skipped if the line is already present). This one line is the skill's only reach-in into core:

import './matrix.js';

3. Configure the ESM patch

The published adapter references matrix-js-sdk/lib/... without .js extensions, which fails under Node 22 strict ESM resolution. Register the committed pnpm patch before installing the package. pnpm reapplies it after every install and fails if the pinned package drifts away from the patch:

patches/@beeper__chat-adapter-matrix@0.2.0.patch

pnpm pkg set 'pnpm.patchedDependencies[@beeper/chat-adapter-matrix@0.2.0]=patches/@beeper__chat-adapter-matrix@0.2.0.patch'

4. Install the adapter package

Pinned to an exact version, the supply-chain policy rejects ranges and latest. The Matrix adapter lives in the @beeper/ namespace and versions on its own track (not the @chat-adapter/* family), so it carries its own pin:

@beeper/chat-adapter-matrix@0.2.0

5. Verify and build