ttf_words.c: TTF-TEXT entry point, hmtx advance widths (item 4.3.7e)

Punch list §25 item 4.3.7e complete. New src/word_source/ttf_words.c
registers TTF-TEXT ( c-addr u x y size color -- ): lazily loads the v1
default font capsule + raster cache once, decodes UTF-8 (C
reimplementation mirroring capsules/fabric.4th's DECODE-UTF8 exactly),
looks up each glyph's cached bitmap, blits via fb_put_pixel, advances
the pen by the glyph's real hmtx advance width scaled to pixels.

Necessary plumbing: ttf_parse() now also locates hhea/hmtx, and
ttf_glyph_advance_width() reads a glyph's advance width -- required for
this item's own "proportional spacing correct" acceptance clause, no
advance-width data existed anywhere else in the parser. Verified in
tools/ttftest.c: A/a/0/space all read advance_width=600, correctly
uniform since JetBrainsMono-Regular.ttf is monospace.

(x,y) is raster pixel space (top-left origin, Y-down), deliberately not
the stroke font TEXT's Cartesian Y-up convention -- recorded explicitly
in ttf_words.h, not conflated.

Verified live, amd64, screendump: injected
S" Hi 4.3.7e!" 200 200 28 16777215 TTF-TEXT over a serial socket after
boot, no error, captured a screendump showing the string rendered
legibly with correct mixed-case/digit/punctuation glyphs and even
spacing. TTF-TEXT is this item's permanent deliverable, not a
throwaway probe. Compile-checked clean on all three architectures.

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

src/word_registry.c

@@ -75,6 +75,7 @@
 #include "word_source/include/defer_words.h"
 #include "word_source/include/framebuffer_words.h"
 #include "word_source/include/keyboard_words.h"
+#include "word_source/include/ttf_words.h"
 
 /**
  * @brief Registers a single FORTH word in the virtual machine
@@ -132,6 +133,7 @@ void register_forth79_words(VM *vm) {
     register_defer_words(vm);     /* Module 27: DEFER / IS late binding */
     register_framebuffer_words(vm); /* Module 28: Console fabric -- raw framebuffer primitives */
     register_keyboard_words(vm); /* Module 29: Console fabric -- raw keyboard scancode diagnostic */
+    register_ttf_words(vm); /* Module 30: TrueType text entry point */
 
     log_message(LOG_INFO, "FORTH-79 Standard word set registration complete");
 }