Consolidate the discourse-cli source into tooling-cli/discourse/
(CLI source, Dockerfile, README, AGENTS.md, validate.sh) with all
documentation rewritten to invoke the container via raw docker run
and credentials from the centralized ~/.creds/discourse.env store.
No bin/ wrapper, no system-dependent paths in the docs.
Removes the old discourse-cli/ subdirectory and updates the
KNELCredsManager consumer table to reference the container directly.
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
