feat(text): parse TEXT via acadrust + extend SDF text to MTEXT

Two related steps for the text pipeline:

- TEXT parsing now goes through acadrust's parse_plain_text (like MTEXT
  uses parse_mtext). text::acad_text_encode parses the value's %% codes —
  including %%u/%%o underline/overline and %%nnn — and re-encodes to the
  stroke tessellator's \L/\O + resolved-Unicode grammar, so OCS no longer
  tokenizes TEXT %% codes itself. (ATTRIB/TOLERANCE/DIMENSION still use the
  local tokenizer for now.) Bumps the acadrust pin to the commit that
  completes the TEXT/MTEXT control-code set.

- SDF text (OCS_TEXT_SDF) now covers MTEXT and every text-producing
  entity, not just top-level TEXT. TextStroke carries a GlyphRun (layout
  params); the collector walks convert()'s TruckObject::Text runs and
  applies annotation scale exactly as tessellate does for strokes.
  layout_glyph_quads shares lff::tokenize_run so %% specials resolve and
  \L/\O decorations are skipped (decoration LINES in SDF are still TODO).

Verified: stroke rendering unchanged with the flag off; SDF glyphs render
correctly for TEXT and MTEXT with OCS_TEXT_SDF=1. 154 lib tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/entities/attribute.rs

@@ -292,6 +292,7 @@ fn build_attr_truck(input: AttrTextInputs<'_>, document: &acadrust::CadDocument)
             origin,
             color: None,
             fill_tris,
+            run: None,
         });
     }
     let _ = input.line_count; // round-trip only — recomputed above

src/entities/text.rs

@@ -6,7 +6,7 @@ use crate::entities::text_support::{
     resolve_dxf_special_chars, resolve_text_style, text_local_bounds,
 };
 use crate::entities::traits::{Grippable, PropertyEditable, Transformable, TruckConvertible};
-use crate::scene::convert::acad_to_truck::{TextStroke, TruckEntity, TruckObject};
+use crate::scene::convert::acad_to_truck::{GlyphRun, TextStroke, TruckEntity, TruckObject};
 use crate::scene::text::lff;
 use crate::scene::model::object::{GripApply, GripDef, PropSection, PropValue, Property};
 use crate::scene::model::wire_model::SnapHint;
@@ -66,9 +66,41 @@ pub struct TextPlacement {
     pub wcs_insertion: [f64; 3],
 }
 
+/// Parse a TEXT value's `%%` control codes through acadrust's `parse_plain_text`
+/// (the same parser MTEXT uses), then re-encode into the stroke tessellator's
+/// inline grammar: specials arrive resolved to Unicode, and `%%u`/`%%o`
+/// underline/overline become `\L…\l` / `\O…\o` decoration markers. This keeps
+/// TEXT parsing in acadrust rather than OCS's own tokenizer.
+fn acad_text_encode(value: &str) -> String {
+    use acadrust::entities::mtext_format::parse_plain_text;
+    let doc = parse_plain_text(value);
+    let mut out = String::new();
+    for para in &doc.paragraphs {
+        for span in &para.spans {
+            let (u, o) = (span.properties.underline(), span.properties.overline());
+            if u {
+                out.push_str("\\L");
+            }
+            if o {
+                out.push_str("\\O");
+            }
+            out.push_str(&span.text);
+            if o {
+                out.push_str("\\o");
+            }
+            if u {
+                out.push_str("\\l");
+            }
+        }
+    }
+    out
+}
+
 fn to_truck(t: &Text, document: &acadrust::CadDocument) -> TruckEntity {
     let p = text_run_placement(t, document);
     let snap_pt = glam::DVec3::new(p.wcs_insertion[0], p.wcs_insertion[1], p.wcs_insertion[2]);
+    // Parse `%%` codes via acadrust, re-encoded for the stroke tessellator.
+    let value = acad_text_encode(&p.value);
     // Strokes are in glyph-local space (origin = [0,0]).
     let (strokes, fill_tris) = lff::tessellate_text_ex(
         [0.0, 0.0],
@@ -77,7 +109,7 @@ fn to_truck(t: &Text, document: &acadrust::CadDocument) -> TruckEntity {
         p.width_factor,
         p.oblique_angle,
         &p.font,
-        &p.value,
+        &value,
     );
     TruckEntity {
         object: TruckObject::Text(vec![TextStroke {
@@ -85,6 +117,15 @@ fn to_truck(t: &Text, document: &acadrust::CadDocument) -> TruckEntity {
             origin: p.origin,
             color: None,
             fill_tris,
+            run: Some(GlyphRun {
+                text: value,
+                font: p.font.clone(),
+                height: p.height,
+                rotation: p.rotation,
+                width_factor: p.width_factor,
+                oblique: p.oblique_angle,
+                tracking: 1.0,
+            }),
         }]),
         snap_pts: vec![(snap_pt, SnapHint::Insertion)],
         tangent_geoms: vec![],

src/entities/text_support.rs

@@ -1,7 +1,7 @@
 use acadrust::types::aci_table::aci_to_rgb;
 use acadrust::{CadDocument, EntityType};
 
-use crate::scene::convert::acad_to_truck::TextStroke;
+use crate::scene::convert::acad_to_truck::{GlyphRun, TextStroke};
 use crate::scene::text::font_face::Face;
 use crate::scene::text::lff;
 
@@ -1175,6 +1175,17 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
                         origin,
                         color,
                         fill_tris,
+                        // `text` is the plain word (specials already resolved,
+                        // no decoration markers); `run_h` is raw like the strokes.
+                        run: Some(GlyphRun {
+                            text: text.clone(),
+                            font: font_name.to_string(),
+                            height: run_h,
+                            rotation: rot,
+                            width_factor: signed_wf,
+                            oblique,
+                            tracking,
+                        }),
                     });
                     if opts.want_glyph_boxes {
                         // Per-character boxes, advancing exactly as

src/entities/tolerance.rs

@@ -249,6 +249,7 @@ impl TruckConvertible for Tolerance {
                 origin,
                 color: None,
                 fill_tris: vec![],
+                run: None,
             }]),
             snap_pts: vec![(snap_pt, SnapHint::Insertion)],
             tangent_geoms: vec![],