chore(tools): improve tool implementation and fix bugs #375
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Updated internal project maintenance tools to be more robust and predictable.
Key changes:
fs_read_file: Fixed line indexing to be 1-based and added validation forstart_lineandend_lineparameters. Corrected the line collection logic to preserve line breaks.fs_modify_file: Removed implicit newline consumption when matching patterns, which was causing double-newline issues or incorrect deletions.cargo_check: Refactored to return structuredOutcomeresults and improved output formatting.ToolResulttype for better error handling and consistency.