Add Deep Search tools and documentation (#5)

* Add new deep search tools for enhanced codebase analysis

- Added comprehensive deep search capabilities for finding code patterns
- Includes tools for semantic search, contextual analysis, and cross-file references
- Enables more sophisticated codebase exploration and understanding

Amp-Thread-ID: https://ampcode.com/threads/T-60e5e2af-dc01-4de0-ad75-5cd98636a286
Co-authored-by: Amp <[email protected]>

* Add Deep Search tools and documentation

Amp-Thread-ID: https://ampcode.com/threads/T-cd0c6054-50a0-45df-98aa-b1546fdb84ad
Co-authored-by: Amp <[email protected]>

* Integrate automatic polling into create_conv tool

- Added built-in polling to deepsearch__create_conv that automatically polls every 10s for up to 5 minutes when using async mode
- Removed deepsearch__add_question (not needed for this use case)
- Removed deepsearch__poll_question (now integrated into create_conv)
- Simplified the API to a single tool that handles question creation and completion seamlessly

Amp-Thread-ID: https://ampcode.com/threads/T-b44e5cdc-c52f-4bfc-a790-cc5eab583193
Co-authored-by: Amp <[email protected]>

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Co-authored-by: Alex Kemper <[email protected]>
Co-authored-by: Amp <[email protected]>

Author: 3 people