fix(tui): avoid compact catalog alias collision

[hashbender]

Summary

• Keep commands.catalog internally consistent when a TUI-only extra command name collides with a registry alias.
• Preserve /compact as the registry alias for /compress in canon while omitting the conflicting TUI extra from catalog pairs/categories.
• Add a regression test for the /compact collision.

Root Cause

• PR feat(commands): /compact alias + preview flags for /compress (#3243 salvage) NousResearch/hermes-agent#57029 added compact as an alias for /compress, so commands.catalog now maps canon["/compact"] to "/compress". The same response still listed the legacy TUI-only /compact display toggle as a concrete pair, giving clients two meanings for the same slash text.

Tests

• python -m pytest tests/test_tui_gateway_server.py -q -k "commands_catalog or complete_slash"
• python -m py_compile tui_gateway/server.py tests/test_tui_gateway_server.py
• git diff --check

Fixes NousResearch#57070

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Mirror-of: NousResearch#57073
NousResearch#57073