feat: publish FreeRTOS C FC04 card

README.md

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+# FC04 — Delay, Blocking, Task States and Deletion
+
+FC04 is a freestanding C11 card for the state and time model of a FreeRTOS
+task. It uses the public API to distinguish Ready, Running, Blocked and
+Suspended, then preserves bounded forensic evidence before self-deletion.
+
+The deterministic experiment contains:
+
+- one periodic task using vTaskDelayUntil() with a two-tick period;
+- one task that suspends itself and is resumed by an observer;
+- one low-priority observer that verifies states and the 2/4/6 wake timeline.
+
+Build and verify with:
+
+    make check
+
+The card is based on Chapter 4 sections 4.7–4.10 of the official FreeRTOS
+Kernel Book. PDF generation and commits are separate explicit operations.