Add tests and comment for SEQNO.RAW exclusion

[ng]

Summary

• Add inline comment explaining why SEQNO.RAW is excluded from _find_latest()
• Add 4 unit tests for the exclusion behavior to guard against regression

Follow-up from adversarial review of #247.

Test plan

• All 4 new tests pass
• Covers: empty dir, SEQNO-only, SEQNO with newer mtime, multiple data files

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0dca2fd9-71dc-473d-ac9b-2fd42927f462

📥 Commits

Reviewing files that changed from the base of the PR and between d62b952 and ae8c6d6.

📒 Files selected for processing (2)

• modules/common/raw_follower.py
• modules/common/test_raw_follower.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/246-seqno-tests

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[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on GitHub release

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