Command line interface for accessing the Open Web Index shards and slices.

docs: add py4lexis4-cmd branch documentation with current status analysis master

Analysis includes: - cmd package structure (320KB total, base.py 1783 lines) - Dual CLI framework issue (Click + partial Typer) - Custom SubCommand system problems - Parameter parsing inconsistencies - Proposed Typer-based architecture - Command inventory for all 6 command classes


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