fix(#55+#56+#53/#54-engine): TTS full natural readout + voice warm-stream/pre-roll

fix(#40+voice+upload): SSOT scorecard parity + Sarvam 30s-truncation + uploaded-PDF retrieval gate

recovery: integrate stalled-session work + de-stale/cleanup (pytest 215 green) [build-fix]

fix(closure+voice+latency): KI-253 — P-bundle from U1 fails (P2 watchdog + P3 mark_rec gate + P4 instrumentation)

fix(closure+hydration+voice+admin): KI-248..KI-251 — V1-V4 bundle from Playwright smoke

fix(arch+robustness): KI-225..KI-235 — Path B single-LLM rewrite + audit bundle

fix(voice+recall): KI-214 + KI-217 + KI-218 bundle

fix(voice+slots+routing): KI-212 + KI-213 + KI-215 + KI-216 bundle

fix(voice+llm+admin): KI-200/201/202/203/204/205/206/207/208/210/211 bundle

feat(voice+session+llm): KI-195 + KI-196 + KI-197 + KI-199 bundle

fix(critical): KI-194 + KI-192 + KI-191 reinforce — voice + fact-find

feat(voice): KI-189 + KI-190 + KI-191 — full DIY barge-in stack

fix(voice): KI-188 — pause SpeechRecognition during TTS to kill echo

fix(voice+admin): KI-185 + KI-186 — AEC echo cancellation + 3-tier admin

fix(voice): KI-174 — revive on visibilitychange + window focus

fix(voice): KI-173 — heartbeat watchdog revives stalled SpeechRecognition

fix(voice+brain+timeout): KI-168 + KI-169 + KI-170 bundle