feat: add reflection-static plugin with simpler self-assessment approach

[dzianisv]

Summary

Adds a new reflection-static.ts plugin that uses a simpler, more reliable approach to task completion verification:

• Static self-assessment question: When session idles, asks the agent "What was the task? Are you sure you completed it? If not, why did you stop?"
• GenAI-powered analysis: Uses a judge session to analyze the agent's self-assessment
• No infinite loops: If agent confirms completion → toast only. If improvements needed → push to continue
• E2E tested: Evaluation scored 5/5 with Python hello world + unit tests task

Why This Approach?

The original reflection.ts had complex stuck detection and compression nudges that were difficult to verify working correctly. This simpler approach:

1. ✅ Asks one clear question
2. ✅ Lets the agent self-assess honestly
3. ✅ Uses GenAI to verify the assessment
4. ✅ Takes appropriate action based on response

E2E Test Results

Metric	Value
Score	5/5
Verdict	COMPLETE
Duration	106 seconds
Files created	hello.py, test_hello.py
Python tests ran	✅ Yes
Python tests passed	✅ Yes

Plugin Effectiveness

Check	Result
✅ Triggered correctly	Yes
✅ Asked self-assessment	Yes
✅ Analyzed response	Yes
✅ Took appropriate action	complete
✅ Helped complete task	Yes

Agent's Self-Assessment Response

1. What was the task?
   The user requested to create a Python application with a function that returns "Hello, World!". This involved:

   • Writing a file (hello.py) with the function.
   • Writing a test file (test_hello.py) to validate the function using pytest.
   • Running the tests and ensuring that they pass without errors.

2. Are you sure you completed it?
   Yes, I am confident that the task was successfully completed.

New Scripts

# Run E2E evaluation test
npm run test:reflection-static

# Deploy reflection-static (disables reflection.ts)
npm run install:reflection-static

# Deploy original reflection.ts (disables reflection-static)
npm run install:global

Checklist

• TypeScript compiles without errors (npm run typecheck)
• Unit tests pass (152 tests) (npm test)
• Plugin load test passes (5 tests) (npm run test:load)
• E2E evaluation test passes (5/5 score) (npm run test:reflection-static)