feat(workflow): enrich workflow/agent metadata from workflowProgress;

lightweight workflowTree, build debounce, minor fixes

  - Index phase, label, model, state, duration, tokens per workflow agent
  - Index duration, total_tokens, status, name per workflow run
  - workflowTree returns parsed result + agent summaries instead of
    dumping all messages
  - 30s debounce on buildIndex to avoid repeated directory scans
  - Fix broken BASH_EXIT_PAT (SQLite LIKE has no character classes)
  - Fix SKILL.md step numbering, document FTS5 hyphen limitation

scripts/runtime.mjs

@@ -22,7 +22,7 @@ function executeQuery(db, scriptContent) {
 function main() {
   const args = process.argv.slice(2);
   if (args[0] === '--build') {
-    buildIndex();
+    buildIndex({ force: true });
     process.stdout.write(JSON.stringify({ ok: true, db: DB_PATH }) + '\n');
     return;
   }