mixed-operator golden test, updated README.md

Added:
- cmd/testdata/{ascii,extended-chars}/mixed_operators_td.txt: TD branching diagram exercising all 5 alternative edge operators in one test

Changed:
- README.md: new "Other edge types" section documenting -.->, ==>, ---, --o, --x, using the same example as in cmd/testdata/{ascii,extended-chars}/mixed_operators_td.txt

Co-Authored-By: Claude Sonnet 5.0 <noreply@anthropic.com>

Author: NCMBianchi

README.md

@@ -162,6 +162,42 @@ $ mermaid-ascii -f ./test.mermaid
 │         │          
 └─────────┘          
 
+# Other edge types
+Besides the default `-->` arrow, flowchart edges also accept `-.->` (dotted), `==>` (thick), `---` (open, no arrowhead), `--o` (circle head), and `--x` (cross head):
+$ cat test.mermaid
+graph TD
+A -.-> B
+A ==> C
+B --- C
+B --o|example| D
+D --x C
+$ mermaid-ascii -f ./test.mermaid
+┌──────────┐          
+│          │          
+│    A     │━━━━━━━┓  
+│          │       ┃  
+└─────┬────┘       ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ▼            ▼  
+┌──────────┐     ┌───┐
+│          │     │   │
+│    B     ├─────┤ C │
+│          │     │   │
+└─────┬────┘     └───┘
+      │            ✕  
+      │            │  
+   example         │  
+      │            │  
+      ●            │  
+┌──────────┐       │  
+│          │       │  
+│    D     ├───────┘  
+│          │          
+└──────────┘          
+
 # Read from stdin
 $ cat test.mermaid | mermaid-ascii
 ┌───┐     ┌───┐     ┌───┐

cmd/testdata/ascii/mixed_operators_td.txt

@@ -0,0 +1,32 @@
+graph TD
+A -.-> B
+A ==> C
+B --- C
+B --o|example| D
+D --x C
+---
++----------+          
+|          |          
+|    A     |=======+  
+|          |       I  
++----------+       I  
+      :            I  
+      :            I  
+      :            I  
+      :            I  
+      v            v  
++----------+     +---+
+|          |     |   |
+|    B     |-----| C |
+|          |     |   |
++----------+     +---+
+      |            x  
+      |            |  
+   example         |  
+      |            |  
+      o            |  
++----------+       |  
+|          |       |  
+|    D     |-------+  
+|          |          
++----------+          

cmd/testdata/extended-chars/mixed_operators_td.txt

@@ -0,0 +1,32 @@
+graph TD
+A -.-> B
+A ==> C
+B --- C
+B --o|example| D
+D --x C
+---
+┌──────────┐          
+│          │          
+│    A     │━━━━━━━┓  
+│          │       ┃  
+└─────┬────┘       ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ┆            ┃  
+      ▼            ▼  
+┌──────────┐     ┌───┐
+│          │     │   │
+│    B     ├─────┤ C │
+│          │     │   │
+└─────┬────┘     └───┘
+      │            ✕  
+      │            │  
+   example         │  
+      │            │  
+      ●            │  
+┌──────────┐       │  
+│          │       │  
+│    D     ├───────┘  
+│          │          
+└──────────┘