feat: publish FreeRTOS C FC09 card

2026-07-19 16:36:03 +02:00
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+# FC09 card plan — Event Groups
+
+## Thesis
+
+An EventGroup is a bit protocol, not a counter. ALL/ANY, clear-on-exit and
+barrier auto-clear are part of the protocol and must be visible in evidence.
+
+```text
+FC09 · Event Groups
+└── Task01 · READY latch + three-party barrier
+    ├── A2/A4 · disjoint masks and participants
+    ├── A5 · E01–E11 deterministic flow
+    ├── A6 · bit value and blocked-task states
+    ├── A7 · handle, wait lists, three stacks and digest
+    ├── A8 · ANY/ALL/clear/sync decisions
+    └── Exercise · compare ANY and ALL on the same trace
+```
+
+Acceptance requires a real EventGroup, finite timeouts, coordinator blocked on
+the partial READY mask, worker A blocked at sync, all three `xEventGroupSync`
+results containing `0x70`, final bits zero and deterministic E01–E11.