feat: Add evally test runner and implementation for vscode-evals

[dcbartlett]

Description

Adds a new test runner designed to evaluated tests over multiple configurable runs. This method allows the tests to be evaluated based on non-deterministic output of the test results. The Testing matrix can also be configured with different suite specific variables and will run the suite with multiple sets of variables to "evaluate" performance based on different inputs.

Adds a new test suite that utilizes the new test runner for apply-diff tests.

Test Procedure

cd apps/vscode-evals && pnpm i && pnpm test:run

Pre-Submission Checklist

• [-] Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• [-] Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

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Important

Introduces evally test runner for non-deterministic outputs and matrix configurations, adding apply-diff test suite and supporting configurations in vscode-evals.

• Behavior:
  • Introduces evally test runner for non-deterministic test outputs and configurable test matrices.
  • Adds apply-diff test suite using evally in applyDiff.matrix.test.ts.
  • Supports multiple test iterations and variable configurations.
• Configuration:
  • Adds .env.local.sample, .vscode-test.mjs, eslint.config.mjs, and tsconfig.esm.json for vscode-evals.
  • Updates package.json scripts for testing and building in vscode-evals.
  • Modifies knip.json to ignore vscode-evals.
• Implementation:
  • Implements runTest.ts to execute tests using @vscode/test-electron.
  • Defines matrix tests in applyDiff.matrix.test.ts and sampleMatrix.test.ts.
  • Adds standaloneRunner.ts for running matrix tests from CLI.
  • Provides utility functions in utils.ts for test execution.
• Package:
  • Adds @roo-code/evally package with TestMatrixRunner and types for matrix testing.
  • Configures evally package with build and test scripts in package.json.

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[roomote]

Rooviewer   See task on Roo Cloud

All issues from previous reviews have been addressed. No new issues found in the latest commit.

• Remove unused suiteJsonStats variable in packages/evally/src/runner/TestMatrixRunner.ts
• Add missing rimraf dependency to apps/vscode-evals/package.json
• Fix incorrect exports in packages/evally/package.json (types export points to .d.ts for import/require)
• Verify model ID openai/gpt-5.1 is intentional or update to a valid model (dismissed by author)

Previous reviews

• c4ca6f7: Review #1
• c3ad4d3: Review #2
• 4f8ad4c: Review #3
• 23f66c3: Review #4

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