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CI test speed - #15
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Test binaries are uncacheable by sccache, so every run rebuilt them at opt-level 3. Deps stay at 3. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes:
CI's Test step spent 4m19s of ~4m50s compiling the 22 workspace test binaries at opt-level 3; the tests themselves ran in 26s
Measured locally (20 cores): workspace rebuild 64s → 16s, test run 9s → 23s, 610/610 pass. Expected on CI: Test step ~4m50s → ~2m15s; this PR's own run is the before/after.