fix: production deployment issues

1. session-monitor: handle timestamp-prefixed transcript filenames
   OpenClaw uses {ISO}_{sessionId}.jsonl — glob for *_{sessionId}.jsonl
   when direct path doesn't exist.

2. session-monitor: skip stale sessions (>5min since last transcript write)
   Prevents creating status boxes for every old session in sessions.json.

3. status-watcher: parse actual OpenClaw JSONL transcript format
   Records are {type:'message', message:{role,content:[{type,name,...}]}}
   not {type:'tool_call', name}. Now shows live tool calls with arguments
   and assistant thinking text.

4. handler.js: fix module.exports for OpenClaw hook loader
   Expects default export (function), not {handle: function}.

5. HOOK.md: add YAML frontmatter metadata for hook discovery.

hooks/status-watcher-hook/handler.js

@@ -99,4 +99,6 @@ async function handle(_event) {
   spawnWatcher();
 }
 
-module.exports = { handle };
+// OpenClaw hook loader expects a default export
+module.exports = handle;
+module.exports.default = handle;