Ship Meshtastic Chat UX, embedded Infonet/SHELL panels, and Docker dev polish.

Rename Mesh Chat to Meshtastic Chat, embed the Infonet terminal with Arti/Tor warmup, improve the agent shell PTY (git in the backend image, operator PATH), and add docker-compose.override for local image builds. Gitignore Hermes Agent runtime installs.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.override.yml

@@ -0,0 +1,10 @@
+# Auto-loaded by `docker compose` — build from local source instead of pulling stale GHCR images.
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: ./backend/Dockerfile
+
+  frontend:
+    build:
+      context: ./frontend