feat: publish FreeRTOS C FC05 card

README.md

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+# FC05 — queues, blocking and byte-copy semantics
+
+The card is a deterministic FreeRTOS C experiment for RV32I/Hazard3. A queue
+of length one exposes both wait lists: the receiver first blocks on an empty
+queue, then the sender blocks while trying to append `M3` to a full queue.
+
+The main proof is not a screenshot-only claim. The source buffer holding `M2`
+is mutated after `xQueueSend()`, while the receiver later obtains the original
+payload from queue storage. A bounded event log, public task state and a stable
+digest connect the UML steps to GDB checkpoints.
+
+```sh
+make check
+python3 /home/user/dev/workspace/stem/tools/card-layouts/tools/build_freertos_c_card.py .
+python3 /home/user/dev/workspace/stem/tools/card-layouts/tools/render_card.py .
+```
+
+Generated HTML is in `web/index.html`; TeX is in `doc/generated/main.tex`.