feat: publish FreeRTOS C FC05 card

doc/card-plan.md

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+# FC05 card plan
+
+## Thesis
+
+A FreeRTOS queue owns a fixed-size byte copy of each enqueued item. Queue
+occupancy controls which sender or receiver is Blocked, while priority decides
+which unblocked task runs next.
+
+## Views
+
+- A2 — message, queue and task structure;
+- A5 — deterministic send/receive sequence;
+- A6 — occupancy and task-state transitions;
+- A7 — GDB-visible full-queue checkpoint;
+- A8 — value versus pointer ownership decision.
+
+## Required evidence
+
+The replay must prove empty blocking, full blocking, FIFO `M1→M2→M3`, retained
+`M2=0x2222` after the producer changes its source to `0xDEAD`, distinct task
+stacks and a deterministic ten-record evidence stream.