fix: detect codex model capacity errors as blocked

[woodgear]

Summary

• classify Codex model-capacity errors as blocked
• limit matching to the bottom three non-empty lines so stale errors remain idle
• publish the updated Codex detection manifest

Validation

• captured the affected pane with herdr agent read <pane> --source detection --format text
• stock Herdr 0.7.5 classified the captured screen as idle; the patched bundled manifest classifies it as blocked
• just ci (Rust 1.96.1, Zig 0.15.2): 3,217 Rust tests, 19 integration asset tests, and 24 plugin marketplace tests passed
• python3 scripts/agent_detection_manifest_check.py --require-website

[coderabbitai]

📝 Walkthrough

Walkthrough

The Codex manifests now detect model-capacity messages as visible blockers. Tests verify blocked detection without activity and stale handling when activity indicators are present.

Changes

Codex capacity detection

Layer / File(s)	Summary
Add the capacity-blocked rule src/detect/manifests/codex.toml, website/agent-detection/codex.toml	Both Codex manifests add the model_capacity_blocked rule for capacity messages in the bottom three non-empty lines. Both manifests update their version and timestamp.
Validate blocked and stale states src/detect/manifest/tests.rs	Tests verify visible blocked detection without activity and stale idle detection when activity history is present.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary change: detecting Codex model-capacity errors as blocked.
Description check	✅ Passed	The description directly explains the detection change, matching behavior, manifest update, and validation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands.}

[coderabbitai]

Actionable comments posted: 1

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ecbd1553-4b96-4d3c-9778-7db59ece392f

📥 Commits

Reviewing files that changed from the base of the PR and between 15442a2 and 30b472c.

📒 Files selected for processing (3)

• src/detect/manifest/tests.rs
• src/detect/manifests/codex.toml
• website/agent-detection/codex.toml