Add Skill: text-concatenation

Extracted from: https://github.com/temiroff/Blacknode.git
Score: 1.0

skills/text-concatenation/SKILL.md

@@ -0,0 +1,61 @@
+---
+name: text-concatenation
+version: 1.0.0
+description: Concatenate two text inputs using Blacknode node graph
+inputs:
+- text_a
+- text_b
+steps:
+- Create a Blacknode Graph instance
+- Add a Text node with param value set to text_a
+- Add a second Text node with param value set to text_b
+- Add a Concat node that accepts inputs 'a' and 'b' and outputs 'value'
+- Add an Output node with input port 'value'
+- Connect first Text node 'value' port to Concat 'a' port
+- Connect second Text node 'value' port to Concat 'b' port
+- Connect Concat 'value' port to Output 'value' port
+- Invoke graph cook on Output 'value' to evaluate and return result
+outputs:
+- concatenated_text
+tags: []
+metadata:
+  source_repo: https://github.com/temiroff/Blacknode.git
+  extracted_at: ''
+  confidence: 0.9
+---
+
+# text-concatenation
+
+Concatenate two text inputs using Blacknode node graph
+
+## Steps
+
+1. Create a Blacknode Graph instance
+2. Add a Text node with param value set to text_a
+3. Add a second Text node with param value set to text_b
+4. Add a Concat node that accepts inputs 'a' and 'b' and outputs 'value'
+5. Add an Output node with input port 'value'
+6. Connect first Text node 'value' port to Concat 'a' port
+7. Connect second Text node 'value' port to Concat 'b' port
+8. Connect Concat 'value' port to Output 'value' port
+9. Invoke graph cook on Output 'value' to evaluate and return result
+
+## Inputs
+
+- text_a
+- text_b
+
+## Outputs
+
+- concatenated_text
+
+## Failure Modes
+
+- Port name mismatch causes connection error
+- Missing runtime or graph not initialized
+- Cook on nonexistent node returns error
+
+## Source
+
+Extracted from: [https://github.com/temiroff/Blacknode.git](https://github.com/temiroff/Blacknode.git)
+Confidence: 0.9