feat: add @tag model override support and remove Qdrant dependencies
- Add model-tags parser for @Tag syntax in chat messages - Support Anthropic models (Sonnet, Haiku, Opus) via @tag - Remove Qdrant vector database from infrastructure and configs - Simplify license model config to use null fallbacks - Add greeting stream after model switch via @tag - Fix protobuf field names to camelCase for v7 compatibility - Add 429 rate limit retry logic with exponential backoff - Remove RAG references from agent harness documentation
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