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>
Colby McHenryandClaude Opus 5
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