fix: generate random tool call IDs and support non-standard ID format…

[shivamashtikar]

…s in Kimi K2 parser

• Replace model-native tool call IDs (e.g. 'functions.get_weather:0') with random UUIDs via make_tool_call_id() to prevent ID collisions across multi-turn agent loops.
• Broaden regex patterns to accept non-standard tool call IDs (e.g. 'toolu_vrtx_xxx', 'call_xxx') instead of only 'name:index' format.
• Add _extract_function_name() with 3 strategies: parse standard ID format, match argument keys against request tool schemas (parameter overlap), and fallback to raw ID.
• Guard against empty tool call extraction when section markers are present but no calls are parsed (return tools_called=False).
• Update tests: remove hardcoded expected IDs, assert random ID format, add tests for parameter-overlap resolution, ID uniqueness, and edge cases.

Purpose

Test Plan

Test Result

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