feat: add OpenProse plugin skills

extensions/open-prose/skills/prose/examples/10-code-review-agents.prose

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+# Code Review Workflow with Agents
+# This example shows how to use agents for a multi-step code review process.
+
+# Define agents with specific roles
+agent security-reviewer:
+  model: opus
+  prompt: "You are a security expert focused on identifying vulnerabilities"
+
+agent performance-reviewer:
+  model: sonnet
+  prompt: "You are a performance optimization specialist"
+
+agent style-reviewer:
+  model: haiku
+  prompt: "You check for code style and best practices"
+
+# Step 1: Quick style check (fast)
+session: style-reviewer
+  prompt: "Review the code in src/ for style issues and naming conventions"
+
+# Step 2: Performance analysis (medium)
+session: performance-reviewer
+  prompt: "Identify any performance bottlenecks or optimization opportunities"
+
+# Step 3: Security audit (thorough)
+session: security-reviewer
+  prompt: "Perform a security review looking for OWASP top 10 vulnerabilities"
+
+# Step 4: Summary
+session: security-reviewer
+  model: sonnet
+  prompt: "Create a consolidated report of all review findings with priority rankings"