Module trailers

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Git commit trailer extraction shared between the pair-programming analysis and the decayed-knowledge reviewer-credit step.

Extracts Co-Authored-By: and Reviewed-By: identities from a commit message. Both trailer keys are treated identically downstream — they each represent a developer who invested attention in a change, and Rigby & Bird (ESEC/FSE 2013) show that reviewer knowledge carries meaningful transfer (66–150% gain), motivating the shared extraction.