fix: remove remaining action-agent references from docs and configs

- Remove action-agent card from site/docs/architecture.html
- Remove action/ directory line from architecture.html
- Update formula comments to reference dispatcher instead of action-agent
- Remove action/action.log from log scan loops in preflight.sh and collect-metrics.sh
- Remove action from find command in agent-smoke.sh

.woodpecker/agent-smoke.sh

@@ -84,7 +84,7 @@ while IFS= read -r -d '' f; do
     printf 'FAIL [syntax] %s\n' "$f"
     FAILED=1
   fi
-done < <(find dev gardener review planner supervisor lib vault action -name "*.sh" -print0 2>/dev/null)
+done < <(find dev gardener review planner supervisor lib vault -name "*.sh" -print0 2>/dev/null)
 echo "syntax check done"
 
 # ── 2. Function-resolution check ─────────────────────────────────────────────