fix(openclaw-plugin): extend default Phase 2 commit wait timeout

[yeyitech]

Summary

• increase the default client-side Phase 2 commit wait timeout from 120s to 300s for commitSession(wait=true)
• reuse the same 300s default for the plugin's background Phase 2 polling logs
• add a regression test proving slow Phase 2 completion after ~200s no longer gets reported as timeout

Testing

• npm test -- --run tests/ut/client.test.ts tests/ut/context-engine-compact.test.ts
• npm test

Closes #1405

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ 1405 - Fully compliant Compliant requirements: Default Phase 2 commit wait timeout increased from 120s to 300s in both client poll and background polling Added regression test for slow Phase 2 completion

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🏅 Score: 95

🧪 PR contains tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ No major issues detected

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