Feature Request: Glob Context Support #116

Please consider adding support for using glob patterns to automatically select workspace files for context. Manually choosing files can be tedious, so defining context via globs would automate this process, improving efficiency and accuracy.

Ideally, this would allow multiple patterns (e.g., "src/**/*.py", "docs/*.md") and crucially, exclusion patterns using ! (like "stuff/i/want/*", "!stuff/i/want/but/not/this/*" or "!src/tests/**"). This offers precise, rule-based control over the context provided to Gemini, similar to how .gitignore or other build tools handle file selection.