v0.6.9

• chore(main): release 0.6.9
• chore(gateway): regenerate openapi.json for pinned_models profile docstrings
• feat(gateway): support profile-qualified ids in per-pool pinned-model set
• fix(gateway): bound pinned-model metric labels and add handler validation tests
• feat(gateway): add per-pool pinned-model set to the pool config API
• fix(server): alias PEFT LoRA adapter names
• fix: scope worker preload models by lane