v0.7.0

Features

• Autosave & crash recovery — a periodic autosave writes .sv$ recovery copies (new SAVETIME command, in minutes; default 10). Saved drawings autosave next to the file; never-saved drawings autosave to the system temp folder. The copies are removed on a clean save or exit, so a leftover .sv$ flags an unclean shutdown with data to recover. (#205)
• .bak backups — writes a .bak backup when overwriting on save (ISAVEBAK toggle), and treats .bak as a first-class openable file type. (#205)
• File-association control — new FILEASSOC command turns .dwg / .dxf association on or off; association is now set up once via the first-launch prompt instead of on every launch. (#205)
• Save-As safeguards — warns before dropping AEC/Civil objects the chosen version can't store, and confirms before overwriting an existing file.
• Right-click to run — after typing a command, right-clicking in the viewport runs it (first press = Enter, second = context menu).
• New commands — REGION, FLATSHOT, CONVTOSURFACE, ARCHIVE / ETRANSMIT, CLOSE, HIDE, VISUALSTYLES, QUICKCALC, HYPERLINK, XOPEN, plus broader standard CAD command coverage.

Fixes

• DWG → DXF conversion — clean up dangling handle references (via an acadrust bump) so converted drawings open without errors in other CAD software.

Full Changelog: v0.6.9...v0.7.0