feat: publish FreeRTOS C FC03 card

doc/page-layout.md

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+# FC03 page layout
+
+## Physical sheets
+
+1. Goal, scope, book mapping and viewpoint index — portrait.
+2. A1 Context — portrait, vertical system boundary.
+3. A2 Structure — landscape.
+4. A4 Application — landscape.
+5. A5 Flow part 1, E01-E07 — landscape.
+6. A5 Flow part 2, E08-E12 — landscape.
+7. A6 State — landscape.
+8. A7 Runtime — landscape.
+9. Task instructions and exercise — portrait.
+
+Every diagram begins on a fresh physical sheet. A5 is one logical sequence
+split at a semantic boundary. Both halves keep the same participants, scale,
+header geometry and vertical origin. The web viewer may join those two sheets
+side by side; print keeps them as separate A4 pages.
+
+No box is cut across a page boundary. A diagram that fits a single physical
+sheet is scaled to that sheet instead of being tiled.
+