font.4th: default system font-set capsule, 113 glyphs (item 4.3.6c)

Punch list §25 item 4.3.6c complete. Digits, upper/lowercase, ASCII
punctuation, Latin-1 Supplement, and General Punctuation, each a
stroke-drawing word in the 4.3.6 em-square convention.

Corrected mid-build: the first pass used G-LINE only, missing that
CIRCLE/ARC/ELLIPSE already existed (4.3.3b). Reworked all round shapes
to use them via new em-square-aware wrappers (G-CIRCLE/G-ARC/G-ELLIPSE/
EM-R, fabric.4th 5000-5002), bounded to quarter/half/three-quarter/
full sweeps to avoid unbounded per-glyph angle tuning. font.4th also
redefines DISPATCH-GLYPH/DRAW-GLYPH themselves, not just the six
DISPATCH-* bucket words, since fabric.4th's originals were compiled
early against the 4.3.6b placeholders (CASE early-binding, §27.6.5).

Three-arch acceptance boot clean, Stadium conservation unchanged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

capsules/fabric.4th

@@ -287,3 +287,33 @@ Block 4924
 : DRAW-GLYPH ( codepoint x y size color -- adv )
   GCOLOR ! GSIZE ! GOY ! GOX !
   DISPATCH-GLYPH ;
+
+Block 5000
+( EM-R/G-CIRCLE: route CIRCLE (4.3.3b) through the em-square )
+( convention (4.3.6), same as G-LINE. EM-R scales a magnitude )
+( (radius) with no GOX/GOY translation. Added for item 4.3.6c.)
+: EM-R ( em-r -- cart-r )  GSIZE @ EM-UNITS */ ;
+VARIABLE GCX VARIABLE GCY VARIABLE GR
+: G-CIRCLE ( gcx gcy gr -- )
+  GR ! GCY ! GCX !
+  GCX @ EM-X  GCY @ EM-Y  0  GR @ EM-R  GCOLOR @
+  CIRCLE ;
+
+Block 5001
+( G-ELLIPSE: route ELLIPSE (4.3.3b) through em-square coords.)
+VARIABLE GRX VARIABLE GRY
+: G-ELLIPSE ( gcx gcy grx gry -- )
+  GRY ! GRX ! GCY ! GCX !
+  GCX @ EM-X  GCY @ EM-Y  0
+  GRX @ EM-R  GRY @ EM-R  GCOLOR @
+  ELLIPSE ;
+
+Block 5002
+( G-ARC: route ARC (4.3.3b) through em-square coords. Angles )
+( (ga0 ga1) are Q48.16 radians, passed through unscaled.     )
+VARIABLE GA0 VARIABLE GA1
+: G-ARC ( gcx gcy gr ga0 ga1 -- )
+  GA1 ! GA0 ! GR ! GCY ! GCX !
+  GCX @ EM-X  GCY @ EM-Y  0  GR @ EM-R
+  GA0 @  GA1 @  GCOLOR @
+  ARC ;