FABRIC.md/ROADMAP.md/ttf_words.c: scope console REPL (4.4), obsolete M8, flip TTF to Cartesian y

FABRIC.md: renumber Artemis-last boundary 4.4 -> 4.5, add new 4.4 REPL item
(console visual design scoped this session -- CANVAS is one shared region
above the REPL strip, 640x480 scroll box centered within it, stroke font,
ANSI color, VM-identity + ACL-identity prompt segments, ~1000-line
scrollback), linked to repl-mockup.png.

ROADMAP.md: mark M8 section OBSOLETE -- replaced by FABRIC.md 4.4, kept for
history only.

ttf_words.c: TTF-TEXT's y argument now Cartesian (origin bottom-left of the
physical framebuffer, y increasing upward) instead of raw framebuffer
coordinates, translated once via fb_height() - y. Verified via amd64
screendump (logs/20260811-070418/), text renders right-side-up with
increasing y moving up the screen.

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

src/word_source/ttf_words.c

@@ -94,7 +94,7 @@ static void ttf_word_text(VM *vm) {
     cell_t color, size, y, x, u, addr_cell;
     vaddr_t a;
     cell_t remaining;
-    uint32_t pen_x;
+    uint32_t pen_x, baseline_y;
     q48_16_t scale;
 
     if (vm->dsp < 5) {
@@ -123,6 +123,11 @@ static void ttf_word_text(VM *vm) {
     a = VM_ADDR(addr_cell);
     remaining = u;
     pen_x = (uint32_t) x;
+    /* Caller-facing (x,y) is Cartesian: origin at the bottom-left of the physical
+     * framebuffer, y increasing upward. fb_put_pixel() takes framebuffer coordinates
+     * (origin top-left, y increasing downward), so flip once here per-call rather
+     * than at every blit site. */
+    baseline_y = fb_height() - (uint32_t) y;
     scale = q48_div(q48_from_u64((uint32_t) size), q48_from_u64(g_ttf_font.units_per_em));
 
     while (remaining > 0) {
@@ -138,7 +143,7 @@ static void ttf_word_text(VM *vm) {
                 for (px = 0; px < bmp.width; px++) {
                     if (bmp.pixels[py * bmp.width + px]) {
                         fb_put_pixel(pen_x + px - TTF_CACHE_MARGIN,
-                                     (uint32_t) y + py - (uint32_t) size - TTF_CACHE_MARGIN,
+                                     baseline_y + py - (uint32_t) size - TTF_CACHE_MARGIN,
                                      (uint32_t) color);
                     }
                 }