refactor: introduce format structs for PEG parser helpers
Add json_tool_call_format and generic_tool_call_format structs to
replace positional arguments in build_json_tool_calls_peg_parser and
build_generic_tool_calls_peg_parser. This makes the API more readable
and self-documenting.
- json_tool_call_format: for JSON-style tool calls with name/arguments
- generic_tool_call_format: for XML-style tool calls with parameters
Updated 18 parser files to use the new struct-based approach.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
