fix(search): use session summaries in search and cap intent summary l…

[lixingjia77]

Description

This PR fixes the session context contract mismatch in search and adds prompt-safety truncation for session summaries.

Specifically:

Session.get_context_for_search() provides summaries (list), but VikingFS.search() was reading summary (singular).
After aligning to summaries, the list is normalized into a single string before passing to intent analysis.
IntentAnalyzer now truncates overly long compression_summary to avoid oversized prompts.
Related Issue

Related Issue

Fixes #493

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

• Updated VikingFS.search() to consume session_info["summaries"] and normalize List[str] via "\n\n".join(...).
• Added compression summary truncation in IntentAnalyzer (MAX_COMPRESSION_SUMMARY_CHARS) before prompt rendering.

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

[CLAassistant]

All committers have signed the CLA.