docs: alpha-gate drafting gap, POLARMODE bit, DWG failsafe boundary, ACIS wording, breadth metric label

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

ROADMAP.md

@@ -21,7 +21,7 @@ is ≈ 600–930 h away.
 
 | Number | Value | Kind |
 |---|---|---|
-| Feature breadth (AutoCAD for Mac menu items with a live command) | **50%** (245 / 491; 2D menus only ≈ 65%) | measured ([parity-checklist.md](docs/parity-checklist.md) + UI-only commands) |
+| Feature breadth (AutoCAD for Mac menu items with a live command) | **50%** (245 / 491 at the 2026-10-10 re-measure, including UI-only commands; not re-measured since; the generated checklist counts engine commands only and now reads 298 / 491; 2D menus only ≈ 65%) | measured ([parity-checklist.md](docs/parity-checklist.md) + UI-only commands) |
 | Ready for real work | **≈ 38%** | estimated ([target-app-parity.md](docs/target-app-parity.md)) |
 | Mainstream practitioner (2D drafter) | **≈ 28%** (lower than the full number: file exchange, stability and interaction discounts multiply) | estimated ([target-app-parity.md](docs/target-app-parity.md#mainstream-practitioner)) |
 | Essentials user | **≈ 46%** | estimated ([target-app-parity.md](docs/target-app-parity.md#essentials-user)) |

docs/file-format-parity.md

@@ -31,7 +31,7 @@ below, and ≈ 20–40 h for 3D exchange formats that wait for 3D modelling.
 
 AutoCAD 2027 opens every DWG version from R2.0 onward and saves 2018 (AC1032, still the current
 DWG format), 2013, 2010, 2007, 2004, 2000 and R14. CADCraft reads DWG by converting it to DXF
-with the `acadrust` 0.6.5 crate (failsafe mode since 0.6.4: a damaged DWG opens with the unreadable records left out and a note saying so, #859) and reading that DXF; it saves by writing its own R2000 DXF and
+with the `acadrust` 0.6.6 crate (failsafe mode since 0.6.4: an object record it can't decode is left out and a note says so, #859; if the file's header or section map can't be read, or it isn't a DWG, the file is rejected) and reading that DXF; it saves by writing its own R2000 DXF and
 converting it to a DWG of the chosen version (#421): SAVEAS `version`, else the drawing's own
 version (the file's `$ACADVER`, 2018 for a new drawing), at least 2004 unless 2000 is asked for.
 The bridge repairs two acadrust gaps in 2010+ DWG (measured with 0.6.3): merged table cells and table-style
@@ -51,7 +51,7 @@ title/header suppression.
 | Web build | — | — | **no** (error: "save as DXF") | no | — |
 
 Everything lost in the DXF read/write paths below is also lost through DWG, plus whatever
-`acadrust`'s own DXF output omits (proxy objects, ACIS data, custom objects: not measured). User
+`acadrust`'s own DXF output omits (proxy objects and custom objects: not measured; ACIS data of solids is kept, #781). User
 report #57: a 10 MB DWG failed after about two minutes; limits now stop runaway conversions
 early (#175), but the throughput problem remains. DGN line style components that no line style
 definition uses (leftovers of DGN imports, hundreds of thousands in some drawings) are left out

docs/roadmap.md

@@ -20,7 +20,7 @@ Opus 5.5 agent-hours.
 5. ~~**Unstub the prompt options** of the most-used commands (F1).~~ Done (#397, #408, #547, #558, #559); the stubs left are listed in F1.
 6. ~~**Autosave, recovery, AUDIT, RECOVER** (F4).~~ Done on the desktop (#406, #416); F4 lists the web-build leftovers.
 7. **The rest of the alpha gate:** ~~block editor and REFEDIT, xref attach (F2, F3), and plot styles
-   with a plot dialog and preview (F14)~~ landed (#824, #818, #525, #410, #160, #186); left: dynamic-block authoring, XCLIP, editing an xref in place (F2, F3), and printing beyond files (F14, H3). ≈ 50–80 h.
+   with a plot dialog and preview (F14)~~ landed (#824, #818, #525, #410, #160, #186); left: the precise-drafting gaps (approximate ellipse and spline intersections, prompt options that still print "not available yet"; U4, F1), dynamic-block authoring, XCLIP, editing an xref in place (F2, F3), and printing beyond files (F14, H3). ≈ 50–80 h.
 
 Items 2 and 7 are the open [alpha gate](#alpha-gate) rows.
 

docs/ui-parity.md

@@ -87,7 +87,7 @@ percentages below are from 2026-10-11 and were not re-measured. Remaining: **≈
 |---|---|---|
 | Ortho (F8) | yes, Shift overrides it while held | yes; holding Shift turns it on or off while held (`Session::snap_cursor`, `snap/tracking.rs`) |
 | Polar tracking increment | yes | yes, measured from ANGBASE; dotted path and "Polar: d < a°" tooltip (`snap/tracking.rs`, `canvas.rs` `draw_tracking`) |
-| Additional polar angles, relative to last segment | yes | additional angles yes (POLARADDANG); relative to the last segment with POLARMODE bit 4 (`snap/tracking.rs`, #450) |
+| Additional polar angles, relative to last segment | yes | additional angles yes (POLARADDANG); relative to the last segment with POLARMODE bit 1 (`snap/tracking.rs`, #450) |
 | Polar distance snap (PolarSnap) | yes | yes: SNAPTYPE 1 steps along the tracking paths by POLARDIST (#450; also over the isometric snap, #633) (`snap/tracking.rs` `polar_snap`) |
 | **Object snap tracking** (acquire points, alignment paths, intersections of paths) | yes, F11 | yes (#379): resting on a snap point acquires it (`+`), resting again releases it, seven at most; horizontal/vertical paths, or every polar angle with POLARMODE 2; Shift to acquire with POLARMODE 8; crossings of two paths, a path and an object, and a path and a polar path snap; tooltip names each path; a typed distance (direct distance entry) runs along the path the cursor is on, measured from the point the path comes from. Engine: `Session::snap_cursor`, `snap/tracking.rs`; AUTOSNAP bits 8 and 16 |
 | Grid (rectangular, major lines, adaptive, limits) | yes | rectangular and isometric (30°, 90° and 150° lines), major lines, adaptive display |