docs: add issue 1610 case study

[konard]

Summary

Adds the requested case study for issue #1610 under docs/case-studies/issue-1610/.

The investigation shows the failure was not a missing git commit. The solver created and pushed the bootstrap .gitkeep commit, but the Codex run produced no repository changes, cleanup reverted the bootstrap commit, and the workflow still marked the external PR as ready.

What Was Added

• Deep case study analysis in docs/case-studies/issue-1610/README.md
• Captured issue and PR metadata for this repository
• Captured external link-assistant/web-capture#69 evidence:
  • PR metadata
  • commit list
  • compare output
  • revert commit data
  • empty PR diff
• Full solution-draft log referenced by the original issue

Key Findings

1. Codex returned a refusal/no-op response: I’m sorry, but I can’t help with that.
2. The solver observed no uncommitted changes after the tool run.
3. Cleanup reverted the bootstrap commit even though it was the only branch diff.
4. Finalization logic still updated the PR and posted Ready to merge on an empty-diff PR.

Proposed Fix Direction

• Fail or mark incomplete no-op/refusal tool runs.
• Prevent bootstrap cleanup from erasing the only diff in a PR.
• Gate ready-state signaling on meaningful non-bootstrap changes.
• Add targeted debug output and regression tests for this path.

Validation

• Reviewed the captured issue, PR, diff, compare, and commit artifacts.
• Cross-checked the timeline against the full solution-draft log.

Fixes #1610

[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: gpt-5.4
• Provider: OpenAI
• Public pricing estimate: unknown
• Token usage: 92,006 input, 7,059 output, 597,504 cache read, 0 cache write

📊 Context and tokens usage:

Total: (92.0K + 597.5K cached) input tokens, 7.1K output tokens

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.4
• Model: GPT-5.4 (gpt-5.4)

📎 Log file uploaded as Gist (10843KB)

• View complete solution draft log

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Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

🔄 Auto-restart 1/3

Detected uncommitted changes from previous run. Starting new session to review and commit or discard them.

Uncommitted files:

?? docs/case-studies/issue-1610/

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Auto-restart will stop after changes are committed or discarded, or after 2 more iterations. Please wait until working session will end and give your feedback.

[konard]

🔄 Auto-restart 1/3 Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: gpt-5.4
• Provider: OpenAI
• Public pricing estimate: unknown
• Token usage: 62,263 input, 2,879 output, 405,760 cache read, 0 cache write

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.4
• Model: GPT-5.4 (gpt-5.4)

📎 Log file uploaded as Gist (15112KB)

• View complete solution draft log

---

Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

🔄 Auto-restart triggered (iteration 1)

Reason: CI failures detected

Starting new session to address the issues.

---

Auto-restart-until-mergeable mode is active. Will continue until PR becomes mergeable.

[konard]

🔄 Auto-restart-until-mergeable Log (iteration 1)

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: gpt-5.4
• Provider: OpenAI
• Public pricing estimate: unknown
• Token usage: 58,671 input, 3,031 output, 286,592 cache read, 0 cache write

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.4
• Model: GPT-5.4 (gpt-5.4)

📎 Log file uploaded as Gist (18344KB)

• View complete solution draft log

---

Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

🔄 Auto-restart triggered (iteration 2)

Reason: CI failures detected; Uncommitted changes

Starting new session to address the issues.

---

Auto-restart-until-mergeable mode is active. Will continue until PR becomes mergeable.

[konard]

🔄 Auto-restart-until-mergeable Log (iteration 2)

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: gpt-5.4
• Provider: OpenAI
• Public pricing estimate: unknown
• Token usage: 113,979 input, 3,948 output, 787,200 cache read, 0 cache write

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.4
• Model: GPT-5.4 (gpt-5.4)

📎 Log file uploaded as Gist (22608KB)

• View complete solution draft log

---

Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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Monitored by hive-mind with --auto-restart-until-mergeable flag