feat(cli): wire all commands via Typer (ingest, search, discover, provenance, ask-stub)
- Implement all CLI commands as specified in F-07: ingest, search, and discover subcommands (leads, citing, cited-by, cocited), and provenance subcommands (scan, add-link, links, bib). - Add ask command stub that exits with code 1 (not yet implemented). - Implement comprehensive tests with mocked dependencies (no real DB/API calls). Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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