mars(kittentts): local STT add-on — faster-whisper in the audio side-venv

Telegram voice-note transcription on mars, no cloud: faster-whisper 1.2.1
(ctranslate2 CPU) installed into the SAME kittentts side-venv via
stt-requirements.txt (appended by the provisioning unit; input stamp
extended). Second auto-patchelf pass RPATHs the newly installed
ctranslate2/av binaries. Container env gains
PYTHONPATH=/opt/data/kittentts-venv/... so hermes's local-stt provider
imports faster-whisper in-process (the image venv is read-only for uid
986, so the built-in lazy installer cannot work there).

Validated live: Telegram voice note transcribed on CPU (i5-4460,
lang=en, text exact) with the same pins.

hosts/mars/kittentts/stt-requirements.txt

@@ -0,0 +1,17 @@
+# STT add-on pins for the KittenTTS side-venv on mars (faster-whisper CPU).
+#
+# APPENDED to hosts/mars/kittentts/requirements.txt by the provisioning unit
+# (see hermes-agent.nix, KittenTTS section) so ONE venv covers the entire
+# local-audio stack: TTS (KittenTTS) + STT (faster-whisper). Shares the
+# numpy/onnxruntime pins already frozen there — no version conflicts.
+#
+# faster-whisper runs CTranslate2 on CPU; the tiny/base model (~150 MB)
+# downloads once from the HF hub then works fully offline. Validated
+# 2026-09-19 with a live Telegram voice note transcribed on i5-4460 CPU.
+#
+# NOTE on av: PyP AV 18.x needs libz/libstdc++ from the host. On NixOS those
+# come via the nix store — the provisioning unit exports LD_LIBRARY_PATH with
+# them at runtime (see hermes-agent.nix's kittenttsLDLibraryPath).
+faster-whisper==1.2.1
+ctranslate2==4.8.2
+av==18.1.0