fix: limit catalog.community.json changes to wiki entry + timestamps only

Reverts the unintended reordering and reformatting of existing extensions
(aide, checkpoint, critique, threatmodel, etc.) and companion's tools array.
Only the new wiki entry and updated_at timestamps are now changed.

Assisted-by: GitHub Copilot (model: claude-sonnet-4.6, autonomous)

Author: Copilot