Live observations showed two engineers both dirty on README.md but zero
collisions firing. Two root causes:
1. normalize() only lowercased and prepended src/, so the same file at
different path depths ("agent.ts" vs "backend/src/agent.ts") never
matched. Replace with lowercased-basename matching.
2. Git ground truth (engineer_states.changedFiles) was only used to set
the unpushed flag, never to match the file. The strongest signal was
wasted.
Detector now fuses vision currentFile AND git changedFiles into one
file->engineers map, so a collision fires when two people share a dirty
file even if both screens aren't on it at the same instant.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AaCFWMkYQmTcuPsxaaACft
Ramis
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