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9d1579dad8
An adversarial mutation audit of the suite added in the previous commit found it guarded the fall-through protocol well but asserted almost nothing about what the helpers do once they OWN the request. 5 of 12 seeded mutations survived. Worst case: deleting the pinned-model dispatch call outright left all 12 tests green. Three holes, now closed (8 tests -> 20): Hole A — the honored-pin path had zero coverage. Both existing pin tests DROP the pin, so the dispatch, the 200-but-empty quality gate, the [408, 429, 500, 502, 503, 504] failover list and the catch(pinErr) branch were unguarded — exactly the logic the 2026-06-21 / 2026-06-22 incident comments call load-bearing. Adds five tests over a seeded healthy provider connection so the pin is actually honored. Hole B — orderRuntimeUnits was only ever driven with `priority`, which is a no-op through it. Four of five strategy branches could be deleted with nothing failing. Adds round-robin rotation and weighted sticky ordering tests. Hole C — recordRuntimeUnitStickySuccess never did anything under test: both its guards need weighted/round-robin, so an early return changed nothing. Covered by the new sticky-batch test. Verified by re-running the mutations rather than assuming: all 7 that previously survived (delete-pin-dispatch, serve-despite-failed-quality, never-fail-over-on-transient, rr-counter-not-advanced, rotation-removed, weighted-sticky-skipped, sticky-recording-no-op) are now killed. The first sticky-batch test I wrote was itself vacuous — asserting "same unit twice" holds equally when the recording helper is stubbed out, since nothing advances the counter either. It now asserts the batch runs out and rotation resumes on the third dispatch, which is what actually distinguishes the two. Also restores API_KEY_SECRET in test.after; it was set at module load and never put back, inconsistent with the DATA_DIR handling beside it. Co-authored-by: diegosouzapw <diegosouzapw@users.noreply.github.com>