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Change ID	Type	Confidence	Plan	Review
0sg1	ci	5.0/5.0	7/7 tasks, 12/12 acceptance ✓	✓ 1 cycle

Impact	+/−	Net
true	+531 / −17	+514
└ impl	+531 / −17	+514
└ tests	+0 / −0	+0

_{generated by fab-kit v2.16.8}

Pipeline: intake ✓ → apply ✓ → review ✓ → hydrate ✓ → ship → review-pr

Summary

drivers.yml is the only automated verification the native drivers have, and nothing pins its toolchain, so a macos-latest image rotation breaks the build silently until a red check lands on an unrelated PR. Separately, three of the file's own rationale comments — held up by this repo's comment policy as the canonical positive example — had drifted false or ambiguous following PRs #168–#172. This change adds on-demand and weekly-scheduled runs plus an SPM cache to drivers.yml, and corrects those three claims in place without touching any surviving rationale.

Changes

• On-demand + scheduled triggers (finding ONE): add workflow_dispatch and a weekly schedule (Mon 05:17 UTC) so toolchain rotation surfaces as an attributable scheduled-run failure instead of a misattributed red check on the next PR that happens to touch a driver path
• SPM dependency cache for the ios job (finding TWO): cache the global SPM clone cache (~/Library/Caches/org.swift.swiftpm), keyed on Package.resolved, since build-drivers-ios.sh wipes DerivedData every run and all 22 packages otherwise re-resolve over the network at the 10x macOS billing rate
• Correct the ios worst-case comment (finding THREE): replace the falsified worst-of-five (9m20s) claim with a dated, run-id-anchored formulation — 10m03s across all 17 recorded runs (run 30572535194), ~2.5x headroom — that cannot rot the same way; the android half is untouched
• Disambiguate the native file count (finding FOUR): "44" becomes "47 native build-input files (24 Kotlin + 20 Swift + 3 *.gradle.kts)" with the definition stated inline
• Correct the proto/** justification (finding FIVE): scope the existing Android rationale explicitly to Android, and add that iOS compiles committed generated Swift with no codegen in this repo, so a proto desync still yields a green ios job

Findings came from an independent adversarial review of PRs #168–#172. Memory hydration updated docs/memory/ci/pr-quality-gate.md and docs/memory/drivers/grpc-contract.md (plus their domain indexes) with the corrected facts and the proto/iOS-desync caveat.

Note: this PR touches drivers.yml, which is in its own paths filter, so the drivers workflow will run on this PR — expected and accepted (costs macOS minutes).

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Run ID: 3a3309b0-cc2d-44b3-8d60-5ffd60d6153e

📥 Commits

Reviewing files that changed from the base of the PR and between 7fdebd0 and 4279be0.

📒 Files selected for processing (9)

• .github/workflows/drivers.yml
• docs/memory/ci/index.md
• docs/memory/ci/pr-quality-gate.md
• docs/memory/drivers/grpc-contract.md
• docs/memory/drivers/index.md
• fab/changes/260731-0sg1-harden-drivers-ci-workflow/.history.jsonl
• fab/changes/260731-0sg1-harden-drivers-ci-workflow/.status.yaml
• fab/changes/260731-0sg1-harden-drivers-ci-workflow/intake.md
• fab/changes/260731-0sg1-harden-drivers-ci-workflow/plan.md

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