feat(sovereign-ci): flip enable_sccache default true (fleet rollout)#25
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Phase 3 pilot verified. F9 over 24 runs on intel (7-day window):
n=24 min=0.00 median=100.00 mean=65.3 p95=100.00 max=100.00
p95 hit rate 100% vs 40% threshold — strong PASS. Bimodal distribution:
cold builds hit ~2-10%, warm runs hit 100% once cache is populated.
Per spec build-performance.md §7 Phase 3 exit criteria, the pilot
signal is sufficient to flip the fleet-default from false → true.
Callers can still disable per-repo:
with:
enable_sccache: false
Also adds F8 (no-github-hosted) allowlist comments to:
- provenance job: SLSA provenance requires GitHub OIDC attestation
endpoint, can only run on hosted.
- pr-gate authorize job: PR authorization must run before self-hosted
to prevent bootstrap loop (non-org PRs would need auth before they
could land on a self-hosted runner).
Refs PMAT-151
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Summary
enable_sccachedefault fromfalse→trueso every reusable-workflow caller gets sccache automatically.enable_sccache: false.# falsify-f8-allow:annotations for the two legitimate hosted-runner jobs (SLSA provenance, PR authorization gate).F9 verification data (intel, 7-day window)
Bimodal: cold-build runs hit 2-10%; warm-cache runs hit 100%. p95=100% means ≥95% of CI runs land on fully warm cache.
Corresponding infra-side parser fix: paiml/infra#49
Expected fleet impact
Test plan
cargo run --example falsify_f9_cache_hit_rate -- --remote intel→ p95=100%Refs PMAT-151