TDD task breakdown for the walking skeleton: diff parsing, forge adapter port
with a local git implementation, rules-based tiering, config loading, analyzer
runner behind a ModelClient port, pi SDK client, aggregator, JSONL emitter, CLI.
Later phases recorded as milestones with done-when criteria.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011Ye1KNFMkkUtmzTypHXkoK
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