fix(apply): share path containment with diff formatters

[SutuSebastian]

Summary

• Add path-containment.ts with shared isWithinProjectRoot / canonicalizeProjectFilePath helpers.
• Wire buildDiffJson to skip rows whose file_path escapes projectRoot (read-side leak).
• Refactor apply-engine to use the same helpers (behavior unchanged).

Test plan

• bun test src/application/output-formatters.test.ts src/application/apply-engine.test.ts
• bun run typecheck

[changeset-bot]

🦋 Changeset detected

Latest commit: 96c3198

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@stainless-code/codemap	Patch

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ec719635-9208-42eb-b8ae-46953c2796ec

📥 Commits

Reviewing files that changed from the base of the PR and between 2fd5eb4 and 96c3198.

📒 Files selected for processing (5)

• .changeset/fix-diff-format-path-containment.md
• src/application/apply-engine.ts
• src/application/output-formatters.test.ts
• src/application/output-formatters.ts
• src/application/path-containment.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/diff-format-path-containment

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