feat: add OpenProse plugin skills

extensions/open-prose/skills/prose/examples/15-inline-sequences.prose

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+# Example 15: Inline Sequences
+# Demonstrates the -> operator for chaining sessions
+
+# Quick pipeline using arrow syntax
+session "Plan the task" -> session "Execute the plan" -> session "Review results"
+
+# Inline sequence with context capture
+let analysis = session "Analyze data" -> session "Draw conclusions"
+
+session "Write report"
+  context: analysis
+
+# Combine inline sequences with blocks
+block quick-check:
+  session "Security scan" -> session "Performance check"
+
+do quick-check
+
+# Use inline sequence in variable assignment
+let workflow = session "Step 1" -> session "Step 2" -> session "Step 3"
+
+session "Final step"
+  context: workflow