Add .git-ai/include.txt to force-index gitignored directories

[Copilot]

Generated code directories (e.g., from code generators, build tools) often live in .gitignore but require indexing for semantic search and code understanding. Previously, these directories were unconditionally excluded.

Changes

• New configuration: .git-ai/include.txt in repository root's .git-ai/ directory

  • Glob patterns (one per line) to force-index specific paths
  • Overrides .gitignore but respects .aiignore

• Priority order: .aiignore > .git-ai/include.txt > .gitignore

• Implementation:

  • Full indexer: Two-pass glob with pattern merging
  • Incremental indexer: Pattern-based filtering with regex cache
  • Proper regex escaping for security

Example

# .gitignore
generated/
dist/

# .git-ai/include.txt
generated/api/**
generated/types/**

Result: generated/api/ and generated/types/ are indexed despite being in .gitignore. Other generated subdirectories remain excluded. Files in .aiignore are never indexed regardless of include patterns.

Pattern Syntax

• directory/ → directory/** (entire directory)
• ** → match any depth
• * → match within segment
• # prefix for comments

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