chore(verify): parallel trace-core replaces the serial lane; trim the compatibility matrix (#236 C4, #227 E2#1-3) - #247
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…bility matrix C4: `--full` no longer runs the ordinary suite single-process. It runs the identical selection at `-n 16 --dist load` under the default trace core, so the trace-vs-sysmon coverage-core cross-check the lane also carried survives intact while its unevidenced isolation claim (lever F, §2 of docs/research/2026-09-01-release-train-wall-clock.md) is given up. `--full` therefore gains a `coverage-combine` lane: xdist workers write their own `.coverage.*` files, which the previous single data file made unnecessary. E2: the 36 pairwise compatibility rows run against the source distribution only — pairwise interaction between two packages' managed blocks is distribution-independent, and source/wheel parity stays proven per package by the single-package, full-set, and partial-migration rows — and the 21 legacy pairwise rows are dropped as redundant with the 14 partial-migration rows and the `all-namespace-legacy` full-set row. Collected compatibility rows: 150 → 129. Repository tooling only; no package, payload, or consumer-visible bytes move. Refs #236, #227
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Summary
Owner decisions D2/D3 ("Both", 2026-09-01):
scripts/verify.sh --fullno longer runs the ordinary selection serially; it runs the same selection at-n 16 --dist loadand adds an explicitcoverage-combinelane so the coverage-core cross-check survives xdist. The compatibility matrix runs its 36 fresh pair rows source-only and drops the 21 legacy pair rows (150 → 129 collected); single-package, full-set, partial-migration, and correction-transition rows keep dual-distribution parity. The record was searched for any red only the wheel arm produced: none exists.Governing work
Supporting: #236
Acceptance coverage
tests/test_repository_test_gate.pypins the new lane order and the fail-fast skip ofcoverage-combine(16 passed).Verification
Trimmed compatibility lane run once remotely at 16 workers: 129 rows green (123 in the first run plus the 6 rows blocked on an unprovisioned
npm ci, re-run green after provisioning); ruff, basedpyright on touched tests, prettier + markdownlint — exit 0.--fullend-to-end is exercised by the integrated battery before release.