Improve backend termination after message and extend timeout (#86)

* Improve backend termination after message and extend timeout

* fix: prevent premature backend termination and revert timeout

Critical fixes for executor.go termination logic:

1. Add onComplete callback to prevent premature termination
   - Parser now distinguishes between "any message" (onMessage) and
     "terminal event" (onComplete)
   - Codex: triggers onComplete on thread.completed
   - Claude: triggers onComplete on type:"result"
   - Gemini: triggers onComplete on type:"result" + terminal status

2. Fix executor to wait for completion events
   - Replace messageSeen termination trigger with completeSeen
   - Only start postMessageTerminateDelay after terminal event
   - Prevents killing backend before final answer in multi-message scenarios

3. Fix terminated flag synchronization
   - Only set terminated=true if terminateCommandFn actually succeeds
   - Prevents "marked as terminated but not actually terminated" state

4. Simplify timer cleanup logic
   - Unified non-blocking drain on messageTimer.C
   - Remove dependency on messageTimerCh nil state

5. Revert defaultTimeout from 24h to 2h
   - 24h (86400s) → 2h (7200s) to avoid operational risks
   - 12× timeout increase could cause resource exhaustion
   - Users needing longer tasks can use CODEX_TIMEOUT env var

All tests pass. Resolves early termination bug from code review.

Co-authored-by: Codeagent (Codex)

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

---------

Co-authored-by: SWE-Agent.ai <noreply@swe-agent.ai>

codeagent-wrapper/main.go

@@ -14,9 +14,9 @@ import (
 )
 
 const (
-	version             = "5.2.5"
+	version             = "5.2.6"
 	defaultWorkdir      = "."
-	defaultTimeout      = 7200 // seconds
+	defaultTimeout      = 7200 // seconds (2 hours)
 	codexLogLineLimit   = 1000
 	stdinSpecialChars   = "\n\\\"'`$"
 	stderrCaptureLimit  = 4 * 1024