fix(T13874): minCount reads the JSON report vitest 5 announces

[kryptobaseddev]

Fixes T13874, the T13782 regression that blocks VidaPeps T2018 to T2022 and T781 on 10.19.

Root cause

I read vitest 5.0.4's JSON reporter in VidaPeps' installed lib/db/node_modules/vitest, file dist/chunks/cli-api.*.js. With --reporter=json and no outputFile, vitest 5 no longer writes the report to stdout. It writes .vitest/json/output.json under its own config root and then prints JSON report written to <absolute path>.

The gate command is pnpm --filter @workspace/db exec vitest …, so the root is lib/db, not the project root. VidaPeps' report is sitting at lib/db/.vitest/json/output.json: 9 tests, all passed, and it satisfies testCountReportSchema. CLEO only looked at <projectRoot>/.vitest/json/output.json, so every minCount gate failed with "emitted no machine-readable test report".

I ruled out two other suspects:

• pnpm passes everything after exec straight through (escapeArgs), so vitest does receive --reporter=json.
• A filtered exec inherits stdio by default, so nothing wraps the output.

Fix

runTestGate now also reads every report path the run announces with vitest's JSON report written to <path> line. Only paths inside the project are read. These paths have no pre-spawn stamp, so the freshness rule still applies: the file's mtime and the report's startTime must both be at or after the spawn.

Tests

Three new cases in packages/core/src/tasks/__tests__/gate-runner.test.ts. Each uses a fake runner that chdirs into lib/db, writes .vitest/json/output.json there and prints vitest's announce line:

• the report is read and the gate passes
• red: an announced report whose startTime predates the run is refused
• red: an announced report outside the project is never read

Not run locally: owner directive, no local heavy runs. CI runs them, along with tsc and the build. Locally I ran biome on both changed files, gate 32 (--base origin/main) and gate 38 (--base origin/main), all OK. The changeset is validated only by CI's Changeset Lint.

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