fix: Remove Matrix integration — notifications move to forge + OpenClaw (#732)

Remove all Matrix/Dendrite infrastructure:
- Delete lib/matrix_listener.sh (long-poll daemon), lib/matrix_listener.service
  (systemd unit), lib/hooks/on-stop-matrix.sh (response streaming hook)
- Remove matrix_send() and matrix_send_ctx() from lib/env.sh
- Remove MATRIX_HOMESERVER auto-detection, MATRIX_THREAD_MAP from lib/env.sh
- Remove [matrix] section parsing from lib/load-project.sh
- Remove Matrix hook installation from lib/agent-session.sh
- Remove notify/notify_ctx helpers and Matrix thread tracking from
  dev/dev-agent.sh and action/action-agent.sh
- Remove all matrix_send calls from dev-poll.sh, phase-handler.sh,
  action-poll.sh, vault-poll.sh, vault-fire.sh, vault-reject.sh,
  review-poll.sh, review-pr.sh, supervisor-poll.sh, formula-session.sh
- Remove Matrix listener startup from docker/agents/entrypoint.sh
- Remove append_dendrite_compose() and setup_matrix() from bin/disinto
- Remove --matrix flag from disinto init
- Clean Matrix references from .env.example, projects/*.toml.example,
  formulas/*.toml, AGENTS.md, BOOTSTRAP.md, README.md, RESOURCES.md,
  PHASE-PROTOCOL.md, and all agent AGENTS.md/PROMPT.md files

Status visibility now via Codeberg PR/issue activity. Human interaction
via vault items through forge. Proactive alerts via OpenClaw heartbeats.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supervisor/AGENTS.md

@@ -4,7 +4,7 @@
 **Role**: Health monitoring and auto-remediation, executed as a formula-driven
 Claude agent. Collects system and project metrics via a bash pre-flight script,
 then runs an interactive Claude session (sonnet) that assesses health, auto-fixes
-issues, reports via Matrix, and writes a daily journal. When blocked on external
+issues, and writes a daily journal. When blocked on external
 resources or human decisions, files vault items instead of escalating directly.
 
 **Trigger**: `supervisor-run.sh` runs every 20 min via cron. Sources `lib/guard.sh`
@@ -40,17 +40,11 @@ runs directly from cron like the planner and predictor.
 **Alert priorities**: P0 (memory crisis), P1 (disk), P2 (factory stopped/stalled),
 P3 (degraded PRs, circular deps, stale deps), P4 (housekeeping).
 
-**Matrix integration**: The supervisor has its own Matrix thread. Posts health
-summaries when there are changes, reports P0-P2 issues, and processes replies
-from humans ("ignore disk warning", "kill that agent", "what's stuck?").
-
 **Environment variables consumed**:
 - `FORGE_TOKEN`, `FORGE_REPO`, `FORGE_API`, `PROJECT_NAME`, `PROJECT_REPO_ROOT`
 - `PRIMARY_BRANCH`, `CLAUDE_MODEL` (set to sonnet by supervisor-run.sh)
 - `WOODPECKER_TOKEN`, `WOODPECKER_SERVER`, `WOODPECKER_DB_PASSWORD`, `WOODPECKER_DB_USER`, `WOODPECKER_DB_HOST`, `WOODPECKER_DB_NAME` — CI database queries
-- `MATRIX_TOKEN`, `MATRIX_ROOM_ID`, `MATRIX_HOMESERVER` — Matrix notifications + human input
 
 **Lifecycle**: supervisor-run.sh (cron */20) → lock + memory guard → run
-preflight.sh (collect metrics) → consume Matrix replies → load formula +
-context → create tmux session → Claude assesses health, auto-fixes, posts
-Matrix summary, writes journal → `PHASE:done`.
+preflight.sh (collect metrics) → load formula + context → create tmux
+session → Claude assesses health, auto-fixes, writes journal → `PHASE:done`.