Fix ty possibly-missing-attribute warnings in tests

[daaain]

ctx.messages is list[Optional[TemplateMessage]] (ghost slots are None), so comprehensions iterating it directly need an 'm is not None' guard. In test_skill_pairing, collect the narrowed SessionHeaderMessage contents instead of the wrapper messages so the isinstance narrowing survives into the follow-up comprehensions.

Summary by CodeRabbit

• Tests
  • Hardened several test assertions to safely ignore None entries while scanning message lists.
  • Improved message lookups for session headers, UUID ordering, session filtering, and rendered output checks.
  • Simplified one branch-header assertion by reading header details directly from the surviving session header objects.
  • No user-facing behavior or public APIs changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 11225553-fe8a-4a95-a80a-166ceba0c344

📥 Commits

Reviewing files that changed from the base of the PR and between 42e54d4 and e71ccd3.

📒 Files selected for processing (3)

• test/test_dag_integration.py
• test/test_hook_attachment_rendering.py
• test/test_skill_pairing.py

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📝 Walkthrough

Walkthrough

Test files updated to add explicit None guards in list/dict comprehensions scanning ctx.messages, preventing unguarded attribute access on None entries. One test also refactors branch-header lookup to extract SessionHeaderMessage objects directly instead of the wrapper message. No production code changes.

Changes

None-safe test message filtering

Layer / File(s)	Summary
DAG integration comprehension guards test/test_dag_integration.py	Adds m is not None guards before isinstance/attribute access when building header_session_ids, msg_uuids, s2_msgs, and rendered_uuids.
Hook attachment rendering comprehension guards test/test_hook_attachment_rendering.py	Adds m is not None guards before isinstance checks for HookAttachmentMessage and SystemMessage in three test cases.
Skill pairing branch header extraction test/test_skill_pairing.py	Refactors branch_headers/skill_branches to collect SessionHeaderMessage objects directly and read parent_message_index from them.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• daaain/claude-code-log#131: Prior changes to the same test_skill_pairing.py assertions around SessionHeaderMessage and parent_message_index extraction.
• daaain/claude-code-log#193: Introduced None ghost slots in ctx.messages, motivating the None-guard filtering added in these test comprehensions.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the changeset: it describes fixing ty warnings in tests, which is the main purpose of the PR.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ty-test-warnings

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