Simplify: drop custom scripts, use native s6 multi-profile supervision

- Remove patch_tts_tool.py (orphaned)
- Remove run-multi-gateways.sh (replaced by s6 native profile supervision)
- Remove start-hermes.sh (overengineered — the image does this natively)
- compose.yml: command: gateway run, drop HERMES_PROFILES env var
- Dockerfile: revert start-hermes.sh COPY addition

Per-profile gateways are now managed by s6-overlay natively:
profiles with desired_state=running in gateway_state.json are
auto-started by the s6 reconciler on boot.

ai/hermes/Dockerfile

@@ -63,11 +63,6 @@ PYEOF
 # Launches one gateway process per profile (HERMES_PROFILES env var)
 COPY --chmod=0755 run-multi-gateways.sh /usr/local/bin/run-multi-gateways.sh
 
-# ---------- Install s6-overlay compatible startup script ----------
-# Runs as the CMD via s6-overlay's main-program model.
-# Replaces the old bash->tini->entrypoint.sh chain that caused SIGTERM crash loops.
-COPY --chmod=0755 start-hermes.sh /usr/local/bin/start-hermes.sh
-
 # ---------- Runtime ----------
 USER hermes
 ENV HERMES_HOME=/opt/data