feat: Model based toolset switching (#111)

Co-authored-by: cpacker <packercharles@gmail.com>

src/tools/descriptions/ReadFileCodex.md

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+# read_file
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+Reads a local file with 1-indexed line numbers, compatible with the Codex `read_file` tool.
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+- **file_path**: Absolute path to the file to read.
+- **offset**: Optional starting line number (1-based) for the slice.
+- **limit**: Optional maximum number of lines to return.
+- **mode / indentation**: Accepted for compatibility with Codex but currently treated as slice-only; indentation mode is not yet implemented.
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