docs: move status manager state diagrams

Agoric · Nov 22, 2024 · fadbf2e · fadbf2e
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diff --git a/packages/fast-usdc/README.md b/packages/fast-usdc/README.md
@@ -56,3 +56,29 @@ sequenceDiagram
 
     A->>TF: notify(evidence)
 ```
+
+# Status Manager
+
+### Contract state diagram
+
+*Transactions are qualified by the OCW and EventFeed before arriving to the Advancer.*
+
+```mermaid
+stateDiagram-v2
+  [*] --> Advanced: Advancer .advance()
+  Advanced --> Settled: Settler .settle() after fees
+  [*] --> Observed: Advancer .observed()
+  Observed --> Settled: Settler .settle() sans fees
+  Settled --> [*]
+```
+
+### Complete state diagram (starting from OCW)
+
+```mermaid
+stateDiagram-v2
+  Observed --> Qualified
+  Observed --> Unqualified
+  Qualified --> Advanced
+  Advanced --> Settled
+  Qualified --> Settled
+```
diff --git a/packages/fast-usdc/src/exos/README.md b/packages/fast-usdc/src/exos/README.md