docs: Write Reference section (CLI options, shortcuts, API limits, env vars)

[shouze]

Context

Parent epic: #24
Depends on: #25 (VitePress initialized)

Pages to create in docs/reference/

cli-options.md

Exhaustive table of all options sourced directly from github-code-search.ts:

Option	Type	Required	Default	Description
--org <org>	string	✅	—	GitHub organization to search in
--exclude-repositories <repos>	string	❌	""	Comma-separated repos to exclude (short or long form)
--exclude-extracts <refs>	string	❌	""	Extracts to exclude (repo:path:index)
--no-interactive	boolean	❌	false	Disable interactive mode
--format <format>	markdown|json	❌	markdown	Output format
--output-type <type>	repo-and-matches|repo-only	❌	repo-and-matches	Output type
--include-archived	boolean	❌	false	Include archived repositories
--group-by-team-prefix <prefixes>	string	❌	""	Team-name prefixes for grouping
--no-cache	boolean	❌	false	Bypass 24 h team-list cache

keyboard-shortcuts.md

Full keymap table: ↑ ↓ ← → Space a n f r h/? Enter q/Ctrl+C.
Separate section for filter-mode bindings: Esc (cancel), Enter (confirm).

github-api-limits.md ⭐ (key page)

Hard limits of the GitHub Code Search API with official documentation references:

• Max query length: 256 characters
• Max results: 1 000 items (10 pages × 100 items/page)
• Max pagination: page 10 (GitHub hard cap for code search)
• Rate limits: 10 req/min unauthenticated · 30 req/min authenticated (code search endpoint)
• Max boolean operators: 5 AND / OR / NOT per query
• NOT operator: not supported in code search (only in issue/PR search)
• Fork repositories: excluded by default — add fork:true to include them
• Minimum query: must contain at least one non-qualifier term
• No regex: code search does not support regular expressions
• Official refs:
  • https://docs.github.com/en/rest/search/search
  • https://docs.github.com/en/search-github/searching-on-github/searching-code
  • https://docs.github.com/en/search-github/github-code-search/understanding-github-code-search-syntax

environment.md

Variable	Description	Default
GITHUB_TOKEN	GitHub PAT (required)	—
CI	Set to true to disable interactive mode	false
GITHUB_CODE_SEARCH_CACHE_DIR	Override cache directory for team lists	OS-dependent path

Acceptance criteria

• All 4 pages exist and render without errors
• github-api-limits.md includes at least 3 links to official GitHub documentation
• CLI options table matches the options defined in github-code-search.ts exactly (including --no-cache)
• No broken links