[zackees]

Summary

• Keep all six release-mode _build.yml target caches and all six release-binaries caches restorable, but stop saving new entries.
• Extend the main-only cache-budget cleanup to retire only those 12 exact release-key families, alongside the already disabled all-features families. Unrelated preflight, coverage, musl, security, and Dylint caches remain outside the selector.
• Document the measured 4,078,226,358-byte footprint and the tradeoff: future release target builds may start cold; release packaging/build/validation remain unchanged.

Closes #1216 after the main cache-budget workflow applies the reviewed cleanup and verifies a converged budget.

Validation

• Focused cache-budget unit tests: 21 passed.
• Cache-save-guard unit tests: 11 passed.
• Cache save guard, Ruff, Black, YAML parse, and diff check passed.
• Sole read-only clud-review: clean.

The repository has no ci-full label/contract; its broad exact-head PR matrix is the full platform gate.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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