feat: implement intelligent context retrieval for auto-ingest mode

[Vidushi2709]

What Changed

Resolved TODO at line 2641 by implementing intelligent context retrieval for auto-ingest mode.

issue -> #119

Implementation

• Core Fix: get_auto_ingest_system_prompt() now uses user_input to search for relevant memories
• Search: Calls db_manager.search_memories() with user query for intelligent retrieval
• Fallback: Gracefully falls back to conscious context when search fails/empty
• Error Handling: Comprehensive exception handling with debug logging
• Linter Fix: Resolved litellm import warning

Tests

Added 7 comprehensive test cases - All passing (7/7):
✓ Happy path with search results
✓ Empty search triggers fallback
✓ Deduplication works correctly
✓ Exception handling
✓ Empty input handling
✓ 5-item limit enforced
✓ Query parameters validated

Impact

Before: Auto-ingest ignored user_input → generic recent memories
After: Auto-ingest performs intelligent search → relevant, context-aware memories

Backward Compatibility

✅ Fully backward compatible - fallback behavior preserved

[harshalmore31]

@Vidushi2709 Thank you for tackling this TODO! However, I need to point out that this functionality already exists in the
codebase.

The Issue

The intelligent context retrieval you've implemented here is already handled by _get_auto_ingest_context()
(line 1164 in memory.py), which:

• Searches the database using user_input (line 1204)
• Has fallback logic to recent memories (line 1276)
• Includes error handling and recursion guards (line 1178)
• Is already called during auto-ingest mode context injection (line 817-822)

Your PR modifies get_auto_ingest_system_prompt(), which is a formatting function. The actual retrieval
happens upstream in _get_auto_ingest_context(). if merged will cause double database queries !

You can update your PR :

• The TODO at line 2641 is misleading and should simply be deleted - the feature is already implemented in
  _get_auto_ingest_context().
• Your tests are well-written though! They could be adapted to test the existing _get_auto_ingest_context()
  function instead.