Phase 3 (Sub-Agent Support):
- session-monitor.js: sub-agents always passed through (inherit parent channel)
- watcher-manager.js enhancements:
- Pending sub-agent queue: child sessions that arrive before parent are queued
and processed when parent is registered (no dropped sub-agents)
- linkSubAgent(): extracted helper for clean parent-child linking
- Cascade completion: parent stays active until all children complete
- Sub-agents embedded in parent status post (no separate top-level post)
- status-formatter.js: recursive nested rendering at configurable depth
Integration tests - test/integration/sub-agent.test.js (9 tests):
3.1 Sub-agent detection via spawnedBy (monitor level)
3.2 Nested status rendering (depth indentation, multiple children, deep nesting)
3.3 Cascade completion (pending tool call tracking across sessions)
3.4 Sub-agent JSONL parsing (usage events, error tool results)
All 95 tests pass (59 unit + 36 integration). make check clean.
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