Chalie AI Dev Log: Voice Improvements & Tooling Refinements

The voice synthesis pipeline received significant upgrades, implementing a pool of 3 independent Kokoro instances to eliminate slowness and replace single-thread serialization. This change is coupled with a new pre-chunk text cascade to prevent truncation errors when exceeding the phoneme length cap.

• Security hardens ReDoS regexes in voice, message-processor, and og-image services.

• document tool is moved from always-available to discoverable, allowing for lazy surfacing and addressing routing biases.