refactor(rules): point redmine-cli invocation at centralized creds store

Merge redmine-cli into tooling-cli/redmine and drop the
redmine-cli/.env source path from the rules. The canonical
invocation now uses ~/.creds/redmine.env (system-independent)
with the registry image. Marks Q2 (bin/ wrapper gap) fully
resolved for both redmine and discourse.

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Assisted-by: Crush:glm-5.2

AGENTS.md

@@ -66,8 +66,8 @@ Replace this bracketed text.>
 ### CLI invocation (no bin/ shortcuts — invoke the real containers)
 
 ```
-# redmine-cli  (source: ~/projects/KNEL-AIMiddleware/redmine-cli/)
-docker run --rm --env-file ~/projects/KNEL-AIMiddleware/redmine-cli/.env \
+# redmine-cli
+docker run --rm --env-file ~/.creds/redmine.env \
     git.knownelement.com/reachableceo/redmine-cli:latest <command>
 # subcommands: whoami, projects, statuses, list, show <id>, create, update <id>, close <id>