feat: switch fork branch to drop-multi-memory (removes 825-line multi-memory patch)

The feat/drop-multi-memory branch on gortium/hermes-agent drops commits:
- 7f3092e feat(agent): support multiple simultaneous memory providers
- 5ff3223 test(agent): update memory tests for multi-provider support
- d10c19f docs: update memory-providers.md for multi-provider support
- d0627af fix(test): remove test_memory_plugin_e2e.py

Configs already use memory.provider: honcho (single provider),
so multi-memory code path was dead code. Piper TTS patch kept.

ai/hermes/Dockerfile

@@ -18,7 +18,8 @@ RUN --mount=type=ssh \
     ssh-keyscan -p 2222 code.lazyworkhorse.net >> /root/.ssh/known_hosts 2>/dev/null && \
     cd /tmp && \
     GIT_SSH_COMMAND='ssh -p 2222 -o StrictHostKeyChecking=no' \
-    git clone --depth 1 --branch main \
+    # Branch feat/drop-multi-memory: upstream + Piper TTS patch only (no multi-memory patch)
+    git clone --depth 1 --branch feat/drop-multi-memory \
     git@code.lazyworkhorse.net:gortium/hermes-agent.git fork && \
     rm -rf fork/node_modules fork/.venv fork/.git && \
     cp -a fork/. /opt/hermes/ && \