feat(engine): add sr-voice LLM inference service for NPC voice pipeline
Standalone Rust crate wrapping llama-cpp-2 for GGUF model inference.
Persistent HTTP server architecture — model loaded once, requests
processed sequentially, zero CPU contention by construction.
Subcommands: serve (load model, listen), generate (single prompt),
batch (JSONL), benchmark (5-run average). Makefile targets for
build/serve/run/stop workflow.
Spike 1 validated: Gemma 2B Q4_K_M at ~16 t/s CPU, 4 cultures
tested (Krenn, Ireland, Shek'na, Aranthi), composition-engine
oath injection mechanism proven. GO for Spike 2.
Refs: D-138, #639
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
1b58d8f949