Replace Python development tooling with Make and containerized shell

AGENTS.md

@@ -22,6 +22,12 @@
   generated outputs. Document the generation workflow so a clean checkout can
   build without committed generated code.
 
+## Local development tooling
+
+Use Make and shell for local development orchestration. Do not introduce Python
+scripts or a Python runtime dependency. Keep bootstrap tools inside Docker so
+the host needs only Make, a POSIX shell and Docker with Compose/BuildKit.
+
 ## Container versions
 
 Use only the latest stable upstream releases for infrastructure, product base