Adds flexible cassette matching that ignores system prompt changes
for o3 models, preventing CI failures when prompts are updated.
Changes:
- Semantic matching: Only compares model name, user question, and core params
- Ignores: System prompts, conversation memory instructions, metadata
- Prevents cassette breaks when prompts change between code versions
- Added comprehensive tests for semantic matching behavior
- Created maintenance documentation (tests/CASSETTE_MAINTENANCE.md)
This solves the CI failure where o3-pro test cassettes would break
whenever system prompts or conversation memory format changed.
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Co-Authored-By: Claude <noreply@anthropic.com>