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Colby McHenry
1d9206d2d0
Coverage for the CG-12 allocator, built around "would this go red if the lever were removed" rather than line coverage — every way this regresses is silent, ending in an agent falling back to Read. Unit (`explore-proportional-allocation.test.ts`, 18 -> 38): calibration pins, envelope safety across every tier and 30 candidate shapes, the cliff boundary, spine weighting/trim survival, the diffuse control, and the degenerate inputs — identical scores, a lone file, a runaway top scorer, zero results, maxFiles 0, a non-finite score. End-to-end (`explore-allocation-e2e.test.ts`, new): CG-6's second regression fixture as a deterministic synthetic mirror — a large relevant file, a small helper that used to win by shipping whole, and an incidental `explore`/`BUDGET` collision — asserting per-file budget share, not file presence. Plus degenerate result sets and a survey-style diffuse control through the real render loop. The live self-query arm stays in probe-allocation.mjs, where drift is a number to re-baseline rather than a red suite. Reverting the render loop to the pre-CG-12 rules reproduces #1500 on the mirror exactly and takes 5 e2e + 2 payroll gates red: file score pre-CG-12 CG-12 src/mcp/allocator.ts 77.5 4,843 (39.7%) 9,335 (80.1%) src/util/budget-math.ts 36.0 6,079 (49.8%) 1,037 ( 8.9%) Two defects the invariants surfaced, both fixed in tools.ts: - rounded shares could sum past `pool`, so "reservations fit the envelope" was approximate rather than exact; both terms now floor - a non-finite score made every share Infinity/Infinity, handing the render loop a NaN allowance; `weightOf` now fails safe to 0 Also adds a hard-ceiling gate to the payroll fixture — at 19.3K against a 19.5K ceiling it is the only fixture that stresses the ~25K inline cap — and exports EXPLORE_ALLOCATION so invariant tests read the constants while one test pins the literals. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>