refactor: reorganize template files and update provisioning paths

backend/templates/BOOT.md

@@ -0,0 +1,12 @@
+# BOOT.md
+
+On startup:
+1) Verify API reachability (GET {{ base_url }}/healthz).
+
+2) Connect to Mission Control once by sending a heartbeat check-in.
+   - Use task comments for all updates; do not send task updates to chat/web.
+   - Follow the required comment format in AGENTS.md / HEARTBEAT.md.
+
+3) If you send a boot message, end with NO_REPLY.
+
+4) If BOOTSTRAP.md exists in this workspace, run it once and delete it.