fix: key prompt-cache affinity on git root, not cwd - #660
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xAI partitions cache by prompt_cache_key. Hashing the leaf cwd made every graff-evals sandbox a cold ~8k write (rematch first-call cache 0–512 vs grok 11k–43k already warm). Seed is the git root so worktrees and sibling sandboxes share; scratch -p uses graff-scratch. Prefix bytes still have to match. ADR 0011.
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280-port of git-root cache affinity already on main. Closing as superseded. |
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Cherry-pick of #659 onto the 280 rematch tip.
Prompt-cache max was already on. The rematch still paid a cold ~8k on every first call because
prompt_cache_keyhashed the leaf cwd. Root affinity is now the git root (worktrees + sibling sandboxes share) orgraff-scratchwhen there is no repo.Prefix bytes still have to match. Children still use role lanes. ADR 0011 updated.
See #659 for the rematch numbers.