feat: add redmine-cli containerized CLI tool

Merge the redmine-cli work from the EnableAI repo into KNEL-AIMiddleware as the
canonical home for AI middleware. This is a standalone CLI (python-redmine 2.5.0)
that lists, shows, creates, updates, and closes Redmine issues via docker run.
Complements the existing mcp-redmine MCP server (protocol-native) with a
direct-invocation tool for interactive use.

Verified end-to-end against projects.knownelement.com: whoami, projects,
statuses, list, show, create, update, and close all tested successfully.

Also records host-cleanliness conventions (docker/tea only on host; custom
images to Gitea registry) in AGENTS.md, and adds a CLI Tools section to
STATUS.md.

AGENTS.md

@@ -45,6 +45,14 @@ ALL work performed on this project MUST be documented in [JOURNAL.md](JOURNAL.md
 - `vendor/` directory is gitignored (cloned repos not committed)
 - Custom Dockerfiles saved in `dockerfiles/` with subdirectory structure
 - KiCAD MCP is host-only - requires KiCAD installed on host machine
+- **Keep the host clean**: only `docker` and `tea` (Gitea CLI) commands run
+  directly on the host. Everything else lives in containers. No host installs
+  of runtimes, CLIs, or packages.
+- **Custom images**: publish to the Gitea container registry at
+  `git.knownelement.com/reachableceo/<image>:<tag>` (Docker is pre-authenticated).
+- **Standalone CLI tools**: containerized CLI tools (not MCP/LSP servers) live
+  in their own top-level directory (e.g. `redmine-cli/`). Invoked on-demand via
+  `docker run --env-file .env <image> <command>`, not as long-running services.
 
 ## Crush Configuration