Tests for architecture-aware KV cache estimation (#4760)
* test: add 66 tests for architecture-aware KV cache estimation
Covers all 5 estimation paths (MLA, Hybrid Mamba, Sliding Window,
Standard GQA, Legacy), GGUF parser for 8 new metadata fields,
_can_estimate_kv gate conditions, quantization scaling, edge cases,
path priority ordering, and lifecycle (init/unload/reparse).
Zero external dependencies beyond pytest. No GPU or network required.
Cross-platform (Linux, macOS, Windows, WSL).
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