Apply remaining sketch constraints to complete preselection

ROADMAP.md

@@ -67,6 +67,9 @@ headline counts in-scope tabs only and lists the deferred ones separately.
   Type a value and press Enter to commit one undo step; rejected values remain editable and
   cancellation leaves the sketch unchanged. Fit keeps geometry clear of the Sketch Palette
   and navigation controls, including enlarged displays and nested pending placements.
+- Curvature and Polygon constraints accept complete preselected operands. Fix/Unfix
+  consumes complete point/curve selections consistently; mixed or ambiguous selections
+  retain the picking workflow. Rejected constraints preserve selection and undo history.
 - Contextual error reporting: a **Create Issue** action beside feature errors opens a
   reviewable GitHub issue draft with the error, operation settings, build diagnostics and
   useful reproduction context. The draft is editable, with optional capture of the actual