feat(commandline): autocomplete suggestions + inventory-based registry

Type-as-you-go suggestion popup above the input that filters known
command names by substring (so `LEADER` surfaces both LEADER and
MLEADER). Up / Down navigates the list, Enter dispatches the
highlighted entry, clicking a row dispatches directly. Esc on a
non-empty input clears the buffer instead of escalating to
command-cancel.

The name corpus comes from `inventory::submit!` blocks placed next
to each `CadCommand` impl rather than a hand-maintained static list.
Adding a new interactive command means dropping one `inventory::submit!`
line in its own module file — the autocomplete picks it up at the
next compile. 98 submissions seeded across 60 module files;
`command::all_registered_command_names()` flattens them at runtime.

One-shot dispatch arms in `app/commands.rs` (NEW, OPEN, SAVE, UNDO,
…) don't have a `CadCommand` impl and are therefore absent from
autocomplete by design.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/home/draw/arc.rs

@@ -1102,3 +1102,16 @@ impl CadCommand for ArcCSLCommand {
         }
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_3P"] });  // Arc3PCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_CSA"] });  // ArcCSACommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_CSL"] });  // ArcCSLCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["A", "ARC"] });  // ArcCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SCA"] });  // ArcSCACommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SCE"] });  // ArcSCECommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SCL"] });  // ArcSCLCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SEA"] });  // ArcSEACommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SED"] });  // ArcSEDCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ARC_SER"] });  // ArcSERCommand

src/modules/home/draw/attdef.rs

@@ -184,3 +184,7 @@ impl CadCommand for AttdefCommand {
         })
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["ATTDEF"] });  // AttdefCommand

src/modules/home/draw/circle.rs

@@ -910,3 +910,12 @@ impl CadCommand for CircleTTTCommand {
         None
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["CIRCLE_2P"] });  // Circle2PCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["CIRCLE_3P"] });  // Circle3PCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["CIRCLE_CD"] });  // CircleCDCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["C", "CIRCLE"] });  // CircleCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["CIRCLE_TTR"] });  // CircleTTRCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["CIRCLE_TTT"] });  // CircleTTTCommand

src/modules/home/draw/donut.rs

@@ -132,3 +132,7 @@ fn make_donut(cx: f64, cy: f64, inner_r: f64, outer_r: f64) -> EntityType {
     p.vertices = vec![v0, v1];
     EntityType::LwPolyline(p)
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["DO", "DONUT"] });  // DonutCommand

src/modules/home/draw/ellipse.rs

@@ -532,3 +532,9 @@ fn line_wire(from: Vec3, to: Vec3) -> WireModel {
         fill_tris: vec![],
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["ELLIPSE_ARC"] });  // EllipseArcCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["ELLIPSE_AXIS"] });  // EllipseAxisCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["EL", "ELLIPSE"] });  // EllipseCommand

src/modules/home/draw/hatch.rs

@@ -423,3 +423,9 @@ impl CadCommand for BoundaryCommand {
         CmdResult::Cancel
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["BOUNDARY"] });  // BoundaryCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["GRADIENT"] });  // GradientCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["H", "HATCH"] });  // HatchCommand

src/modules/home/draw/hatchedit.rs

@@ -161,3 +161,7 @@ impl CadCommand for HatcheditCommand {
         CmdResult::Cancel
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["HATCHEDIT", "HE"] });  // HatcheditCommand

src/modules/home/draw/line.rs

@@ -94,3 +94,7 @@ impl CadCommand for LineCommand {
         })
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["L", "LINE"] });  // LineCommand

src/modules/home/draw/mline.rs

@@ -157,3 +157,7 @@ fn build_mline(pts: &[Vec3], scale: f64, closed: bool, style_name: &str) -> Enti
     mline.style_name = style_name.to_string();
     EntityType::MLine(mline)
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["ML", "MLINE"] });  // MlineCommand

src/modules/home/draw/point.rs

@@ -55,3 +55,7 @@ impl CadCommand for PointCommand {
         None
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["PO", "POINT"] });  // PointCommand

src/modules/home/draw/polyline.rs

@@ -321,3 +321,7 @@ impl CadCommand for PlineCommand {
         ))
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["PL", "PLINE"] });  // PlineCommand

src/modules/home/draw/ray.rs

@@ -173,3 +173,8 @@ impl CadCommand for XLineCommand {
         })
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["RAY"] });  // RayCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["CONSTRUCTIONLINE", "XL", "XLINE"] });  // XLineCommand

src/modules/home/draw/revcloud.rs

@@ -133,3 +133,7 @@ fn make_revcloud(pts: &[Vec3], arc_len: f64) -> EntityType {
     p.vertices = vertices;
     EntityType::LwPolyline(p)
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["REVCLOUD"] });  // RevCloudCommand

src/modules/home/draw/shapes.rs

@@ -633,3 +633,12 @@ fn edge_poly_params(a: Vec3, b: Vec3, sides: u32) -> Option<(Vec3, f32, f32)> {
     let sa = angle_xy(center, a);
     Some((center, vr, sa))
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["POLY_C"] });  // PolyCCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["POL", "POLY", "POLYGON"] });  // PolyCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["POLY_E"] });  // PolyECommand
+inventory::submit!(crate::command::CommandRegistration { names: &["RECT_CEN"] });  // RectCenCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["REC", "RECT", "RECTANG"] });  // RectCommand
+inventory::submit!(crate::command::CommandRegistration { names: &["RECT_ROT"] });  // RectRotCommand

src/modules/home/draw/spline.rs

@@ -118,3 +118,7 @@ impl CadCommand for SplineCommand {
         ))
     }
 }
+
+
+// ── Autocomplete registry ─────────────────────────────────
+inventory::submit!(crate::command::CommandRegistration { names: &["SPL", "SPLINE"] });  // SplineCommand