feat: add efficiency warnings for single SEARCH/REPLACE blocks in apply_diff

[roomote]

This PR addresses issue #6054 by adding efficiency warnings to the apply_diff tool when only one SEARCH/REPLACE block is used, similar to how the read_file tool warns when only one file is read.

Changes Made

1. Updated tool descriptions in diff strategies:

   • Added efficiency warning to multi-search-replace.ts getToolDescription
   • Added efficiency warning to multi-file-search-replace.ts getToolDescription

2. Created dynamic warning functions:

   • Added getApplyDiffDescription in applyDiffTool.ts for legacy format
   • Added getApplyDiffDescription in multiApplyDiffTool.ts for multi-file format
   • These functions detect single SEARCH/REPLACE blocks and show appropriate warnings

3. Updated assistant message presentation:

   • Modified presentAssistantMessage.ts to use the new description functions
   • Ensures warnings are shown to models during tool usage

4. Added comprehensive tests:

   • Created getApplyDiffDescription.spec.ts with tests for both legacy and multi-file formats
   • Tests verify warnings appear for single blocks and not for multiple blocks

Benefits

• Encourages models to batch multiple changes in a single apply_diff call
• Reduces API usage and improves efficiency
• Consistent with existing read_file tool behavior
• Helps models learn better practices through inline guidance

Testing

All tests pass:

• Unit tests for the new functionality ✅
• Existing tool tests remain passing ✅
• Linting and type checks pass ✅

Fixes #6054

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Important

Adds efficiency warnings for single SEARCH/REPLACE blocks in apply_diff tool, encouraging batching of changes for improved efficiency.

• Behavior:
  • Adds efficiency warnings for single SEARCH/REPLACE blocks in apply_diff tool, similar to read_file tool.
  • Updates getToolDescription in multi-search-replace.ts and multi-file-search-replace.ts to include warnings.
  • Introduces getApplyDiffDescription in applyDiffTool.ts and multiApplyDiffTool.ts to dynamically generate warnings.
• Functionality:
  • Modifies presentAssistantMessage.ts to use new description functions for displaying warnings.
• Testing:
  • Adds getApplyDiffDescription.spec.ts with tests for single and multiple SEARCH/REPLACE blocks.
  • Tests ensure warnings are shown for single blocks and not for multiple blocks.
• Benefits:
  • Encourages batching multiple changes in a single apply_diff call.
  • Reduces API usage and improves efficiency.
  • Consistent with existing read_file tool behavior.

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