[#674] Create mermaid diagrams for 3 main TCR variants (original, btc…

…r and relaxed)

variants-doc/variant-btcr.mermaid

@@ -0,0 +1,25 @@
+graph LR
+    START((start))
+    BUILD{build}
+    TEST{test}
+    COMMIT["✅ commit (src + tests)"]
+    REVERT["❌ revert (src + tests)"]
+    END((end))
+    START --> BUILD
+    BUILD -->|pass| TEST
+    BUILD -->|fail| END
+    TEST -->|pass| COMMIT
+    TEST -->|fail| REVERT
+    COMMIT --> END
+    REVERT --> END
+    classDef boundaryclass fill: #555555
+    classDef buildclass fill: #0077CC
+    classDef testclass fill: #0077CC
+    classDef okclass fill: #006600
+    classDef failclass fill: #660000
+    class START boundaryclass
+    class BUILD buildclass
+    class TEST testclass
+    class COMMIT okclass
+    class REVERT failclass
+    class END boundaryclass

variants-doc/variant-original.mermaid

@@ -0,0 +1,20 @@
+graph LR
+    START((start))
+    TEST{test}
+    COMMIT["✅ commit src + tests)"]
+    REVERT["❌ revert (src + tests)"]
+    END((end))
+    START --> TEST
+    TEST -->|"pass"| COMMIT
+    TEST -->|"fail"| REVERT
+    COMMIT --> END
+    REVERT --> END
+    classDef boundaryclass fill: #555555
+    classDef testclass fill: #0077CC
+    classDef okclass fill: #006600
+    classDef failclass fill: #660000
+    class START boundaryclass
+    class TEST testclass
+    class COMMIT okclass
+    class REVERT failclass
+    class END boundaryclass

variants-doc/variant-relaxed.mermaid

@@ -0,0 +1,25 @@
+graph LR
+    START((start))
+    BUILD{build}
+    TEST{test}
+    COMMIT["✅ commit (src + tests)"]
+    REVERT["❌ revert (src)"]
+    END((end))
+    START --> BUILD
+    BUILD -->|pass| TEST
+    BUILD -->|fail| END
+    TEST -->|pass| COMMIT
+    TEST -->|fail| REVERT
+    COMMIT --> END
+    REVERT --> END
+    classDef boundaryclass fill: #555555
+    classDef buildclass fill: #0077CC
+    classDef testclass fill: #0077CC
+    classDef okclass fill: #006600
+    classDef failclass fill: #660000
+    class START boundaryclass
+    class BUILD buildclass
+    class TEST testclass
+    class COMMIT okclass
+    class REVERT failclass
+    class END boundaryclass