PR created: https://github.com/RoM4iK/tinker/pull/81
## Summary
Fixed ActiveModel::ForbiddenAttributesError when calling update_ticket MCP tool.
## Root Cause
The handle_update_ticket method was passing ActionController::Parameters directly to ticket.update! without converting to a plain hash. Rails strong parameters protection was rejecting the unpermitted parameters.
## Fix
Call .to_h on sliced params to convert ActionController::Parameters to plain hash before passing to update!. This is safe because we explicitly slice only the allowed fields (title, description, priority, pull_request_url).