TODO Next: subagent parallelism (task tasks batch)

task now accepts { description, prompt, kind } or
{ tasks: TaskSpec[], kind? } (up to 8) and fans out with
Promise.all. Each subagent keeps its own context window and
the progress panel receives start/step/result/end per id, so
independent searches overlap in wall time instead of queueing.

- src/subagent.ts: runOne extracted, createTaskTool uses union
  schema (single | batch), batch validates worker channel once
  then Promise.all, results joined as headings.
- docs/agents.md: delegation section notes tasks batch.
- 800 pass (added subagent-parallel.test.ts).

.hermes/plans/todo-now-next.md

@@ -14,7 +14,7 @@ TODO.md status 2026-09-08:
 1. **Now flip + tests** — patch TODO.md [x], test: hot-reload skill mid-session callable, pruned decision recoverable. Verifikasi: bun test.
 2. **Derive tool-name lists** — tandai mutating di definisi tool (tools.ts/tools-extra.ts/tools-git.ts/tools-net.ts), TOOL_SETS & MUTATING_TOOLS derive + test coverage. Risiko: silently ungated write jika lupa.
 3. **MCP tanpa schema tax** — DONE: phi 3 meta-tools mcp_list/mcp_inspect/mcp_call (mcpExpose=phi/direct/auto), prompt hanya nama server, permission+guard lewat built-in, keep direct registration untuk server 2-tool. Test: server 20-tool 0 schema sampai mcp_call (mcp.test.ts).
-4. **Subagent parallelism** — task terima beberapa investigations, run Promise.all dengan panel fan-out, test overlap waktu.
+4. **Subagent parallelism** — DONE: task `tasks` union + Promise.all fan-out (8 cap), panel per-subagent, test overlap waktu (subagent-parallel.test.ts).
 5. **Undo a turn** — snapshot file-tool edits pre-prompt (cap 100), /undo restores files+conversation atau keduanya, /redo, bash tidak ter-snapshot (docs), test edit reverted + record hilang.
 6. **Maintenance polish** — pricing source+date, estimateTokens label everywhere /cost, listPaths notice staleness / refresh, MUTATING derive dari #2.