ci(diet): path-filter the non-required heavy gates on PRs (tier A) - #310
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The agents generate more CI than the fleet absorbs: with no path-filtering, every PR — including docs- and artifact-only ones — detonates the full matrix. This economizes the NON-REQUIRED heavy workflows so a PR only runs the ones its changes can actually affect. Deadlock-safe by construction: these five checks (Coverage, Rocq+Gappa, Lean, Spar, Bazel/cascade) are NOT in branch protection's required set (verified against the API: only Clippy/Format/Verification-gate/Test×3/Kani-gate are required), so a path-skipped run never leaves a required check pending. Filters are applied to the `pull_request` trigger ONLY — every `push: main` stays UNFILTERED, so main-branch evidence/gates always run in full (the backstop, and where a too-narrow glob would still be caught). Globs err generous (a miss on a non-required check = green-PR-then-red-main, not a silent hole): bazel includes wasm/** + embedded/** (the cascade composes wasm/cm/flight); rocq includes crates/relay-math/** (drift catch — the proofs hardcode the kernel coefficients). Tier B (the real prize — Kani ×24, Test ×3, Verification-gate) touches REQUIRED checks and needs the job-level `if` + skip-safe aggregate pattern; it follows as its own carefully-validated PR. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HvusAXYbHLyv3uTzfBcMbG
avrabe
enabled auto-merge (squash)
July 23, 2026 06:02
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Why
Multiple agents generate more CI than the self-hosted fleet can absorb. With no path-filtering, every PR — even docs- or artifact-only — detonates the full matrix (Kani ×24, 90-min Verification gate, Test ×3, Coverage, Spar, Bazel, Rocq, Lean). This is the "agents clog the runners" problem.
What (Tier A — the safe tier)
Path-filter the non-required heavy workflows so a PR only runs the ones its changes can affect:
crates/**,wasm/**,embedded/**,Cargo.*proofs/rocq/**,proofs/gappa/**,crates/relay-math/**(drift catch)proofs/lean/**spar/**,wit/**crates/**,wasm/**,embedded/**,proofs/**,wit/**, all Bazel filesWhy this is deadlock-safe
Filtering a required check at the workflow level is dangerous: a skipped required check sits "pending" forever and blocks every merge. These five are NOT required — verified against the branch-protection API (only
Clippy/Format/Verification gate/Test ×3/Kani gateare required). A skipped non-required check never blocks a merge.Safety choices
push: mainstays UNFILTERED on all five — every main commit still produces full coverage/proof/cascade evidence (the DO-178C/EN-50128 record), and it's the backstop where a too-narrow glob is still caught.wasm/**on bazel (the cascade composeswasm/cm/flight) andcrates/relay-math/**on rocq (the proofs hardcode the kernel coefficients).Validation plan (watched)
After merge, bidirectionally: a docs-only PR must skip all five; a
proofs/**orcrates/relay-math/**PR must still fire Rocq. One-directional (skip works) would miss the glob-miss failures.Follow-up: Tier B (the real prize)
Kani ×24, Test ×3, and the Verification gate are the actual monsters — but they're required, so they need the job-level
if+ skip-safe aggregate pattern (kani-gateis already anif: always()shim, but currently fails on askippedmatrix — that gets fixed there). Separate, carefully-validated PR.🤖 Generated with Claude Code