Add coh docs command

[Copilot]

Now that coherent.docs exists, expose it as a first-class coh docs subcommand alongside the existing test and build commands.

Changes

• __main__.py: Add docs as a passthrough_command, invoking coherent.docs via runpy.run_module
• __init__.py: Declare coherent.docs in __requires__

@passthrough_command
def docs() -> None:
    del sys.argv[1]
    runpy.run_module('coherent.docs', run_name='__main__')

Original prompt

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This section details on the original issue you should resolve

<issue_title>New command coh docs</issue_title>
<issue_description>Now that coherent.docs exists, add a command coh docs that invokes that library on the local project.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes New command coh docs #13

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