[#674] Add "introspective" variant statechart image

- create variant-introspective.mmd
- update other diagrams to add "VCS" on VCS-related actions
- generate png files

variants-doc/mmd/variant-btcr.mmd

@@ -2,8 +2,8 @@ stateDiagram-v2
     direction LR
     state "⚙️ build" as Build
     state "⚙️ test" as Test
-    state "✅ commit (src + tests)" as Commit
-    state "❌ revert (src + tests)" as Revert
+    state "✅ VCS commit (src + tests)" as Commit
+    state "❌ VCS revert (src + tests)" as Revert
     [*] --> Build
     Build --> Test: pass
     Build --> [*]: fail

variants-doc/mmd/variant-introspective.mmd

@@ -0,0 +1,24 @@
+stateDiagram-v2
+    direction LR
+    state "⚙️ build" as Build
+    state "⚙️ test" as Test
+    state "✅ VCS commit (src + tests)" as CommitPass
+    state "❌ VCS commit (src + tests)" as CommitFail
+    state "⏪ VCS revert (last commit)" as CommitRevert
+
+    [*] --> Build
+    Build --> Test: pass
+    Build --> [*]: fail
+    Test --> CommitPass: pass
+    Test --> CommitFail: fail
+    CommitPass --> [*]
+    CommitFail --> CommitRevert
+    CommitRevert --> [*]
+    classDef actionClass fill: #0077CC
+    classDef okClass fill: #006600
+    classDef failClass fill: #660000
+    class Build actionClass
+    class Test actionClass
+    class CommitPass okClass
+    class CommitFail failClass
+    class CommitRevert actionClass

variants-doc/mmd/variant-original.mmd

@@ -1,8 +1,8 @@
 stateDiagram-v2
     direction LR
     state "⚙️ test" as Test
-    state "✅ commit (src + tests)" as Commit
-    state "❌ revert (src + tests)" as Revert
+    state "✅ VCS commit (src + tests)" as Commit
+    state "❌ VCS revert (src + tests)" as Revert
     [*] --> Test
     Test --> Commit: pass
     Test --> Revert: fail

variants-doc/mmd/variant-relaxed.mmd

@@ -2,8 +2,8 @@ stateDiagram-v2
     direction LR
     state "⚙️ build" as Build
     state "⚙️ test" as Test
-    state "✅ commit (src + tests)" as Commit
-    state "❌ revert (src)" as Revert
+    state "✅ VCS commit (src + tests)" as Commit
+    state "❌ VCS revert (src)" as Revert
     [*] --> Build
     Build --> Test: pass
     Build --> [*]: fail