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[codex] Add speech synthesis research insights#22
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Adds two durable speech-synthesis insights: one on F5-TTS/E2-TTS flow-matching architecture and one on Resemble AI Chatterbox internals.
Includes the corresponding deep-research source audits under
brain/inbox/dr/so the claims, caveats, and benchmarks have an evidence trail.The notes explain model data flow, training signals visible from public code and papers, performance claims, and production failure modes for engineers evaluating these TTS systems.
Validation: reviewed the staged and PR diffs, and ran
git diff --cached --check.