[RemyDegenne]

#262 pinned TauCetiReview at ec743f1, which sends the shared protocol and the pull request as a cached prompt block, so that rubrics after the first in a round read the PR from the cache. In that version, each rubric's Claude Code ran with a different HOME, which changed Claude Code's own system prompt between rubrics, so the cache was not reused. TauCetiProject/TauCetiReview#227, merged as 7d59664, gives all the Claude attempts of a review one HOME.

With 7d59664, the review runs archived in TauCetiData since the merge (4 rounds on TauCeti PRs, 37 Claude rubric runs) show the cache working:

• First rubric of each round: it writes the shared part, 8–14k tokens.
• Later rubrics: the 8 whose first request can be isolated all read the shared part from the cache and write only their own 1–2k tokens. Of the 33 later rubrics, 21 certainly hit the cache, 12 can't be told from the records, and none is seen missing.
• Cost: the 4 rounds cost $4.20, against an estimated $7.55–8.65 with the old layout.

Changes: every TauCetiReview pin, ec743f1 → 7d59664, all at once as in #262: tauceti.toml ([tools.review] ref), the uses: lines and review_ref in .github/workflows/auto-merge.yml and merge-sweep.yml, and .github/actions/checkout-merge-policy/action.yml. Between the two commits, only runner/reviewers.py and a test change, so the reusable workflows and the rubrics (and their fingerprint) are the same.

Like #262, this PR changes .github/, so it may need an admin merge. After the merge, restart running workers so that they pick up the new pin. A worker started without TAUCETI_CONF reads tauceti.toml from the checkout it runs in, so that checkout must be up to date.

Roadmap: none

🤖 Generated with Claude Code