test(sub-packages): add 33 tests for cache, sample, tokenizer
- cache_test.go (10): KVCache and RotatingKVCache — creation, single/multi
update, bounded sliding window, reset, state access
- sample_test.go (8): greedy, temperature (high/low), topK (single/multi),
chain composition, TopP/MinP stub pass-through
- tokenizer_test.go (15): Load (valid/missing/invalid), BOS/EOS detection,
encode produces tokens, decode skips specials, decode regular tokens,
DecodeToken (regular/special/space/unknown), FormatGemmaPrompt,
GPT-2 byte maps (round-trip, printable ASCII, control chars)
Total test count: 29 → 148 across 10 test files.
Co-Authored-By: Virgil <virgil@lethean.io>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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