Detailed Description

Purpose
-------
Enable ``python oct`` and ``python -m oct`` invocations by delegating to the
OCT CLI entry point.

Responsibilities
----------------
- Provide the ``__main__`` entry point for directory/module-mode invocation.
- Delegate unconditionally to ``oct.cli:cli``.
- Contain no logic of its own.

Diagnostics
-----------
Domain: OCT-CLI
Levels:
    L2 - lifecycle
    L3 - semantic details
    L4 - deep tracing

Contracts
---------
- Must contain no business logic.
- Must delegate entirely to ``oct.cli:cli``.

Dependencies
------------
- oct.cli (cli - the command group this entry point runs)
- oct.core.diagnostics (_dbg structured logger, imported but not called)