[5/11] test(rules): add private evaluator parity harness

[aidenybai]

Part 5 of 11. Review this PR against codex/internal-architecture-04-package-aware-rules.

What changed

• Adds the private rule evaluator and project/source testkit.
• Adds differential fixtures comparing evaluator results with oxlint.
• Extends fuzz variants to preserve evaluator verdicts.

Why

The package-aware rule work needs a deterministic in-process harness that detects semantic drift from the production oxlint path.

Impact

Private test/evaluation infrastructure; no published API or CLI changes.

Validation

• Full workspace typecheck at this exact commit
• Plugin and fuzz typechecks
• 76 evaluator, testkit, and oxlint-parity tests

Stack

Review only each PR's diff against its base branch. Merge in order.

1. #1463 — Git service decomposition
2. #1478 — Core execution pipeline
3. #1479 — Workspace package graph
4. #1480 — Package-aware rules
5. #1487 — Private evaluator parity
6. #1482 — API/LSP adapter facades
7. #1483 — CLI workflow decomposition
8. #1481 — CLI facade import migration
9. #1484 — Architecture and compatibility gates
10. #1485 — Shared deslop cycle traversal
11. #1486 — Architecture docs and skill sync

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/eslint-plugin-react-doctor@1487

npm i https://pkg.pr.new/oxlint-plugin-react-doctor@1487

npm i https://pkg.pr.new/react-doctor@1487

commit: 811beba

[aidenybai]

Closing this private evaluator harness slice as part of the regression-risk reduction. The original architecture stack has been replaced by four independent correctness/performance PRs that each target main. The full rewrite remains preserved on codex/internal-architecture-rewrite-full if we want to revisit it separately.