Add delete_tool: trash-based tool removal with restore support ...

Moves tool files to tools/.trash/ instead of deleting permanently.
Actions: remove (trash + unregister), restore (recover + re-register), list.
Data files are intentionally left in place on both remove and restore.
Available only in the developer profile.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>