Issue Summary

Subagent system is broken. spawn_agent calls are made but subagents never actually execute or return results.

Evidence

From session logs (v0.6.0+):

Session: 20260317-015147_D0AC6CKBK5K_1773712306_785559

• 01:52:19: spawn_agent called with task: "Navigate to Reddit and post comment about TextForge"
• 01:52:23: Main session immediately continues with search_tools, browser_navigate, store_memory
• Result: No subagent result returned, no subagent execution

Pattern: Main session never waits for subagent, continues executing tools directly instead.

Expected Behavior

1. spawn_agent spawns separate subagent
2. Main session blocks/wait for subagent result
3. Subagent executes task and returns result
4. Main session receives completion

Actual Behavior

1. spawn_agent called
2. Main session ignores result
3. Main session executes tools directly
4. Subagent task never executed

Impact

• 0 successful subagent completions since v0.6.0 shipped
• All spawn_agent calls are no-ops
• Breaking feature: agents can't delegate tasks

Root Cause Hypothesis

• Subagent system not properly wired to return results
• No hardening around subagent execution
• Missing evals for subagent completion verification

Next Steps

1. Add hardening to spawn_agent tool
2. Create evals to verify subagent completion
3. Add timeout/error handling for subagent failures
4. Log subagent execution status separately from main session