Overview

The motion_close extrinsic previously declared a constant weight that did not account for the inner call dispatched as Root when a motion is approved. Substrate can only refund weight post-dispatch, never increase it, so the inner
call's weight was never pre-charged. This adds a proposal_weight_bound parameter following the pallet_collective::close pattern, ensuring the declared weight includes the inner call's weight upfront. The extrinsic is also made DispatchClass::Operational to match the other governance extrinsics. Toolkit and upgrader are updated to pass the new parameter.

Closes: https://shielded.atlassian.net/browse/PM-22326

🗹 TODO before merging

• Ready

📌 Submission Checklist

• Changes are backward-compatible (or flagged if breaking)
• Pull request description explains why the change is needed
• Self-reviewed the diff
• I have included a change file, or skipped for this reason:
• If the changes introduce a new feature, I have bumped the node minor version
• Update documentation (if relevant)
• Updated AGENTS.md if build commands, architecture, or workflows changed
• No new todos introduced

🧪 Testing Evidence

Please describe any additional testing aside from CI:

• Additional tests are provided (if possible)

Manual testing

🔱 Fork Strategy

• Node Runtime Update
• Node Client Update
• Other:
• N/A

Links