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/vault-poll.sh

@@ -91,7 +91,6 @@ for action_file in "${VAULT_DIR}/approved/"*.json; do
     log "fired $ACTION_ID (retry)"
   else
     log "ERROR: fire failed for $ACTION_ID (retry)"
-    matrix_send "vault" "❌ Vault fire failed on retry: ${ACTION_ID}" 2>/dev/null || true
   fi
 
   unlock_action "$ACTION_ID"
@@ -112,7 +111,6 @@ for req_file in "${VAULT_DIR}/approved/"*.md; do
     log "fired procurement $REQ_ID (retry)"
   else
     log "ERROR: fire failed for procurement $REQ_ID (retry)"
-    matrix_send "vault" "❌ Vault fire failed on retry: ${REQ_ID} (procurement)" 2>/dev/null || true
   fi
 
   unlock_action "$REQ_ID"
@@ -143,7 +141,6 @@ for action_file in "${VAULT_DIR}/pending/"*.json; do
     AGE_HOURS=$((AGE_SECS / 3600))
     log "timeout: $ACTION_ID escalated ${AGE_HOURS}h ago with no reply — auto-rejecting"
     bash "${VAULT_DIR}/vault-reject.sh" "$ACTION_ID" "timeout (${AGE_HOURS}h, no human reply)" >> "$LOGFILE" 2>&1 || true
-    matrix_send "vault" "⏰ Vault auto-rejected ${ACTION_ID} — no reply after ${AGE_HOURS}h" 2>/dev/null || true
   fi
 done
 
@@ -184,7 +181,6 @@ if [ "$PENDING_COUNT" -gt 0 ]; then
 
   bash "${VAULT_DIR}/vault-agent.sh" >> "$LOGFILE" 2>&1 || {
     log "ERROR: vault-agent failed"
-    matrix_send "vault" "❌ vault-agent.sh failed — check vault.log" 2>/dev/null || true
   }
 fi
 
@@ -216,15 +212,6 @@ for req_file in "${VAULT_DIR}/pending/"*.md; do
 
   log "new procurement request: $REQ_ID — $REQ_TITLE"
 
-  # Notify human via Matrix
-  matrix_send "vault" "🔑 PROCUREMENT REQUEST — ${REQ_TITLE}
-
-ID: ${REQ_ID}
-Action: review vault/pending/${REQ_ID}.md
-To approve: fulfill the request, add secrets to .env, move file to vault/approved/
-
-$(head -20 "$req_file")" 2>/dev/null || true
-
   # Mark as notified so we don't re-send
   mkdir -p "${VAULT_DIR}/.locks"
   touch "${VAULT_DIR}/.locks/${REQ_ID}.notified"