Remove Base command-prefix normalization from generic command filters

[codeforester]

Summary

base_cli.command_filters still contains Base-specific command-prefix normalization, including the literal base_ prefix used by Base history and log filtering.

Scope

• make generic command filter normalization operate on consumer-provided policy or neutral command names
• move Base's base_ prefix and compatibility aliases into the Base adapter
• preserve Base history/log behavior with focused regression coverage
• document the consumer extension point for command-display/filter policy

This follows base-cli#23 and is part of the remaining work tracked by #19.

Acceptance criteria

• the standalone package has no hard-coded Base command prefix
• Base behavior remains unchanged through an explicit adapter policy
• generic consumers can define their own command normalization without importing Base code