Changes with no impact on existing DDL/API functions

Copilot v2.1 adds a human-in-the-loop clarification step, lets you copy full assistant replies, displays selected items above the input, and ships a batch of tool-handler fixes

• Clarification tool — Copilot asks the user to choose between options (flag / Snowflake tag / Model Governance field, etc.) instead of guessing on ambiguous requests
• Show selected items above the chat input
• Copy full agent response (all messages produced in reply to a single user message), not just one
• Expanded Copilot tools and updates to existing tools
• (Fix) Changing schema color via Copilot now also updates the colors of tables in that schema
• (Fix) Model Governance field tool now rejects label strings passed as selectValueIds with an actionable error, instead of silently saving an invalid binding