The publish path restored a uv cache, and CI stored whatever the current major prunes - #50

Closes ZED-56. Two commits, .github/ only.

1. release.yml build: enable-cache: true → false

The job triggers on tag push, writes the dist/ the id-token-holding job then uploads under our identity, and a PyPI version is never replaceable. A restorable uv cache is an input to that build, and an Actions cache entry is writable by anything that can run a workflow on the default branch. setup-uv v10.0.0 reached the same conclusion from upstream's side: auto now disables the cache for release, tag push, pull_request_target and workflow_run (#984). true opted out of that.

false, not the auto the v10.2.0 pin would honour — a deliberate departure from the card's wording. auto is upstream's default, and its meaning already moved under this step once: at v5.4.2 it meant only "cache on GitHub-hosted runners" and would have cached this very tag push. Naming the posture means the next major cannot change what the publish path restores without changing this line too — the card's own point-2 argument, applied to point 1. One word to change if a reviewer disagrees.

cache-dependency-glob goes with it: it computed a cache key, and there is no cache to key. #52's reasoning for why it keyed pyproject.toml rather than uv.lock is preserved in the comment that replaces it, so re-enabling the cache restores both together.

Cost: uv build plus uvx twine check resolving the build-system requirements cold, once per release.

2. ci.yml: prune-cache: true, explicit

Unset meant "whatever the pinned major decided": true through v8, false from v9.0.0 (#967). The pin is v10.2.0, verified by reading action.yml at the exact pinned SHA c18668a rather than at the tag — so prune-cache is a real input there and the default it overrides is the one actually in effect. The three matrix legs are saving unpruned caches today, and began doing so as a side effect of a version bump rather than a decision. Quota, not correctness: a pruned cache is a smaller cache, not a staler one, and cache-dependency-glob: uv.lock is what governs staleness.

Both knobs carry comments naming allowed values, the chosen value and why, per the CLAUDE.md rule — folded into the commit that introduces each, so no commit ships a load-bearing knob undocumented.

Governance

Merges on self-review under D4, no board card. DECISIONS.md D4 carve-out 1 covers the authority a workflow runs with — credentials, permissions, secrets, id-token, environment: — and excludes "not pinning, not workflow hygiene" by name; the ZED-52 ratification adds that it is "about authority, not shape". This change touches none of those and only tightens the publish path toward upstream's own tag-push default. (An earlier revision of ZED-56 called this carve-out 1 and required a card; the CTO overruled that on ZED-67.) No D9 clause 3 conflict: no other open issue holds merge authority over this PR.

Verification

• Six real Actions checks on the current head, FORGE_REQUIRE_TOOLS=1, after ZED-66 restored runners. The branch was rebased onto current master; nothing here rests on the pre-outage run.
• Both workflows parse; the two setup-uv steps resolve to the intended inputs (build: enable-cache: false; tests: enable-cache: true, prune-cache: true, cache-dependency-glob: uv.lock).
• Inputs verified at the exact pinned SHA c18668a, not at the v10.2.0 tag.
• No fingerprint movement is possible: tests/fingerprint.py classifies paths inside a generated project root, so the repository's own .github/ is never an input.

Merged via git push rather than gh pr merge — the latter 403s on .github/workflows/** for want of the workflow token scope.

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