selection-scoped agent, usda round-trip diff, batch accept

The agent learned to listen to your selection this week. Scope a prompt to the entities you have selected and the agent only proposes edits inside that boundary, which turns vague layout requests into precise, reviewable batches. We also hardened the interchange path you own: the .usda exporter now writes text we are confident you can read and hand-edit, and a round-trip diff proves the Canvas does not silently rewrite your file when you re-import it. To keep large agent runs manageable at the gate, batch accept groups related proposals so you can land a whole intent in one step or peel off the parts you want to hand-tune.