[iamnbutler]

Quick wins from the triage of #7 and #2.

• Ace dev loop: hidden build errors and lint scanning .build backups (move to ace2) #7
  • src/build.ts now names the checkout path when it restores a checkout that matches no pinned prefix. The message also says that local edits there are discarded.
  • The final "differs from the pinned patch stack" error names the path too.
  • docs/build.md step 3 no longer says drift fails the build. It now describes the restore, which has been the behavior since fix: keep each patch's upstream tests passing with the stack #10, and says to keep wanted edits in a patch.
• Finish native pointer delivery and validation #2: docs/tools.md now says not to drag a window's title bar or edge to move or resize it, and to use desktop_move and desktop_resize instead.

Whether a reset without a backup is acceptable (#7) is left to that issue.