feat: add OpenProse plugin skills

extensions/open-prose/skills/prose/examples/11-skills-and-imports.prose

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+# Skills and Imports Example
+# This demonstrates importing external skills and assigning them to agents.
+
+# Import skills from external sources
+import "web-search" from "github:anthropic/skills"
+import "summarizer" from "npm:@example/summarizer"
+import "file-reader" from "./local-skills/file-reader"
+
+# Define a research agent with web search capability
+agent researcher:
+  model: sonnet
+  prompt: "You are a research assistant skilled at finding information"
+  skills: ["web-search", "summarizer"]
+
+# Define a documentation agent with file access
+agent documenter:
+  model: opus
+  prompt: "You create comprehensive documentation"
+  skills: ["file-reader", "summarizer"]
+
+# Research phase
+session: researcher
+  prompt: "Search for recent developments in renewable energy storage"
+
+# Documentation phase
+session: documenter
+  prompt: "Create a technical summary of the research findings"