Feature request: Support .gitignore and/or exclusion patterns

[linhle123]

Problem

Nuanced indexes all JS/TS files in a directory, including files that shouldn't be analyzed:

• Build output directories (dist/, build/, out/)
• Test artifacts and fixtures
• Vendored/bundled third-party libraries
• Generated code

Impact

• Bundled files (e.g., webpack/esbuild output) can contain entire libraries, inflating function counts from hundreds to thousands
• Analysis times go from seconds to 60+ seconds (hitting timeouts)
• Memory usage spikes (observed 2-3GB for bundled code)
• Code graph becomes noisy with library internals

Requested solutions (any would help)

1. Respect .gitignore by default - Most common exclusions are already there
2. Support a .nuancedignore file - Similar to .dockerignore, allows project-specific exclusions
3. Add --exclude flag to nuanced index - CLI option for ad-hoc exclusions (e.g., nuanced index --exclude "dist/**")
4. Add --include flag - Explicitly specify what to index

Current workaround

Manually delete artifacts before indexing, or use explicit directory arguments.