The ID disambiguation logic treated 'offlinebrew-3d0' as ambiguous when
child IDs like 'offlinebrew-3d0.1' existed. Now the system:
1. Checks for exact full ID matches first (issue.ID == input)
2. Checks for exact hash matches (handling cross-prefix scenarios)
3. Only falls back to substring matching if no exact match is found
Added test cases verifying:
- 'offlinebrew-3d0' matches exactly, not ambiguously with children
- '3d0' without prefix still resolves to exact match
Amp-Thread-ID: https://ampcode.com/threads/T-5358ea57-e9ea-49e9-aedf-7044ebf8b52a
Co-authored-by: Amp <amp@ampcode.com>
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