dlt/faultline/resolve

Resolve Faultline error group from $ARGUMENTS. The first token is the group id; the rest (if any) is the note.

1. Call get_error_group with the id and show the user: exception_class, message, occurrence_count, last_seen_at, and current status.
2. If status is already resolved or ignored, stop and tell the user — don't re-resolve.
3. Ask the user to confirm before mutating.
4. On confirmation, call resolve_error_group with id and note (omit note if none was given).
5. Report the new status from the tool response.

If the tool returns error: "Tool disabled: mcp_readonly is true", tell the user to set c.mcp_readonly = false in their Faultline initializer — this is a mutating tool and is off by default.