fix: ignore Anchor generated directory

[MolhamHamwi]

Summary

• add .anchor/ to generated directory prefixes in @ghbounty/diff-filter
• cover both nested and top-level .anchor/ generated paths in classify tests

Verification

• pnpm --filter @ghbounty/diff-filter test
• pnpm --filter @ghbounty/diff-filter typecheck
• pre-commit: pnpm typecheck
• pre-commit: pnpm test

Closes #67

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[Copilot]

Pull request overview

Updates @ghbounty/diff-filter to treat Anchor’s .anchor/ output directory as generated content so it’s ignored during diff filtering, reducing noise from Solana/Anchor build artifacts (per #67).

Changes:

• Add .anchor/ to GENERATED_DIR_PREFIXES so both top-level and nested .anchor/ paths are filtered.
• Add test cases to ensure .anchor/ paths are classified as generated_dir.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/diff-filter/src/patterns.ts	Adds .anchor/ to the generated directory prefix list so Anchor artifacts are ignored.
packages/diff-filter/tests/classify.test.ts	Adds coverage for both nested and top-level .anchor/ paths in generated-dir classification tests.

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