feat: add OpenProse plugin skills

extensions/open-prose/skills/prose/examples/13-variables-and-context.prose

@@ -0,0 +1,51 @@
+# Example 13: Variables & Context
+#
+# This example demonstrates using let/const bindings to capture session
+# outputs and pass them as context to subsequent sessions.
+
+# Define specialized agents for the workflow
+agent researcher:
+  model: sonnet
+  prompt: "You are a thorough research assistant who gathers comprehensive information on topics."
+
+agent analyst:
+  model: opus
+  prompt: "You are a data analyst who identifies patterns, trends, and key insights."
+
+agent writer:
+  model: opus
+  prompt: "You are a technical writer who creates clear, well-structured documents."
+
+# Step 1: Gather initial research (captured in a variable)
+let research = session: researcher
+  prompt: "Research the current state of quantum computing, including recent breakthroughs, major players, and potential applications."
+
+# Step 2: Analyze the research findings (using research as context)
+let analysis = session: analyst
+  prompt: "Analyze the key findings and identify the most promising directions."
+  context: research
+
+# Step 3: Get additional perspectives (refreshing context)
+let market-trends = session: researcher
+  prompt: "Research market trends and commercial applications of quantum computing."
+  context: []
+
+# Step 4: Combine multiple contexts for final synthesis
+const report = session: writer
+  prompt: "Write a comprehensive executive summary covering research, analysis, and market trends."
+  context: [research, analysis, market-trends]
+
+# Step 5: Iterative refinement with variable reassignment
+let draft = session: writer
+  prompt: "Create an initial draft of the technical deep-dive section."
+  context: research
+
+# Refine the draft using its own output as context
+draft = session: writer
+  prompt: "Review and improve this draft for clarity and technical accuracy."
+  context: draft
+
+# Final polish
+draft = session: writer
+  prompt: "Perform final editorial review and polish the document."
+  context: draft