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>

vault/PROMPT.md

@@ -29,8 +29,8 @@ For each pending JSON action, decide: **auto-approve**, **escalate**, or **rejec
 |----------|------------|---------------------------------------------|
 | low      | true       | auto-approve → fire immediately             |
 | low      | false      | auto-approve → fire, log prominently        |
-| medium   | true       | auto-approve → fire, matrix notify          |
-| medium   | false      | escalate via matrix → wait for human reply   |
+| medium   | true       | auto-approve → fire, notify via vault/forge  |
+| medium   | false      | escalate via vault/forge → wait for human reply |
 | high     | any        | always escalate → wait for human reply       |
 
 ## Rules
@@ -94,18 +94,9 @@ source ${FACTORY_ROOT}/lib/env.sh
 bash ${FACTORY_ROOT}/vault/vault-fire.sh <action-id>
 ```
 
-### Escalate via Matrix
+### Escalate
 ```bash
-matrix_send "vault" "🔒 VAULT — approval required
-
-Source:  <source>
-Type:    <type>
-Risk:    <risk> / <reversible|irreversible>
-Created: <created>
-
-<one-line summary of what the action does>
-
-Reply APPROVE <id> or REJECT <id>" 2>/dev/null
+echo "PHASE:escalate" > "$PHASE_FILE"
 ```
 
 ### Reject
@@ -125,8 +116,7 @@ ROUTE: <action-id> → <auto-approve|escalate|reject> — <reason>
 
 - Process ALL pending JSON actions in the batch. Never skip silently.
 - For auto-approved actions, fire them immediately via `vault-fire.sh`.
-- For escalated actions, move to `vault/approved/` only AFTER human approval
-  (vault-poll handles this via matrix_listener dispatch).
+- For escalated actions, move to `vault/approved/` only AFTER human approval.
 - Read the action JSON carefully. Check the payload, not just the metadata.
 - Ignore `.md` files in pending/ — those are procurement requests handled
   separately by vault-poll.sh and the human.