feat: add OpenProse plugin skills

extensions/open-prose/skills/prose/examples/roadmap/README.md

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+# Roadmap Examples
+
+These examples demonstrate **planned** OpenProse syntax that is **not yet implemented**.
+
+They are included to show the direction of the language and gather feedback on the design.
+
+## Planned Features
+
+| Feature | Status | Example File |
+|---------|--------|--------------|
+| Agent definitions | Planned | `simple-pipeline.prose` |
+| Named sessions | Planned | `simple-pipeline.prose` |
+| Parallel execution | Planned | `parallel-review.prose` |
+| Variables & context | Planned | `iterative-refinement.prose` |
+| Loops & conditionals | Planned | `iterative-refinement.prose` |
+| Imports | Planned | `syntax/open-prose-syntax.prose` |
+
+## Do Not Run These Examples
+
+These files will not work with the current interpreter. They are for reference only.
+
+For working examples, see the parent `examples/` directory.

extensions/open-prose/skills/prose/examples/roadmap/iterative-refinement.prose

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+# Iterative Refinement Example
+# Write draft, get feedback, refine until approved
+
+agent writer:
+  model: opus
+
+agent reviewer:
+  model: sonnet
+
+let draft = session: writer
+  prompt: "Write a first draft about AI safety"
+
+loop until **approved**:
+  let feedback = session: reviewer
+    prompt: "Review this draft and provide feedback"
+    context: draft
+
+  draft = session: writer
+    prompt: "Improve the draft based on feedback"
+    context: { draft, feedback }

extensions/open-prose/skills/prose/examples/roadmap/parallel-review.prose

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+# Parallel Review Example
+# Three reviewers analyze code in parallel, then synthesize
+
+agent reviewer:
+  model: sonnet
+
+parallel:
+  security = session: reviewer
+    prompt: "Review this code for security issues"
+  performance = session: reviewer
+    prompt: "Review this code for performance issues"
+  style = session: reviewer
+    prompt: "Review this code for style and readability"
+
+session synthesizer:
+  model: opus
+  prompt: "Synthesize the reviews into a unified report"
+  context: { security, performance, style }

extensions/open-prose/skills/prose/examples/roadmap/simple-pipeline.prose

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+# Simple Pipeline Example
+# Research a topic, then write an article
+
+import "web-search" from "github:example/web-search"
+
+agent researcher:
+  model: sonnet
+  skills: ["web-search"]
+
+agent writer:
+  model: opus
+
+session research: researcher
+  prompt: "Research the latest developments in quantum computing"
+
+-> session article: writer
+  prompt: "Write a blog post about quantum computing"

extensions/open-prose/skills/prose/examples/roadmap/syntax/open-prose-syntax.prose

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+# OpenProse - Confirmed Syntax
+# Python-like indentation, keyword-driven, minimal punctuation
+
+# ============================================
+# IMPORTS (quoted skill names)
+# ============================================
+
+import "web-search" from "github:example/web-search"
+import "summarizer" from "./skills/summarizer"
+
+# ============================================
+# AGENT DEFINITIONS (quoted skills array)
+# ============================================
+
+agent researcher:
+  model: sonnet
+  skills: ["web-search", "summarizer"]
+  permissions:
+    bash: deny
+
+agent writer:
+  model: opus
+  skills: ["summarizer"]
+
+# ============================================
+# SIMPLE FLOW
+# ============================================
+
+# Simplest program: single session
+session "Explain quantum computing"
+
+# Sequential (indentation = sequence)
+do:
+  session: researcher
+    prompt: "Research quantum computing"
+  session: writer
+    prompt: "Write a blog post"
+
+# Inline sequence with arrow
+session "A" -> session "B" -> session "C"
+
+# ============================================
+# PARALLEL EXECUTION (quoted modifiers)
+# ============================================
+
+# Default: wait for all, fail-fast
+parallel:
+  session "Security review"
+  session "Performance review"
+  session "Style review"
+
+# Race: first to complete wins
+parallel ("first"):
+  session "Try approach A"
+  session "Try approach B"
+
+# Continue on failure
+parallel (on-fail: "continue"):
+  session "Risky operation 1"
+  session "Risky operation 2"
+
+# Named results for downstream use
+parallel:
+  security = session "Security review"
+  perf = session "Performance review"
+
+session "Synthesize":
+  context: { security, perf }
+
+# ============================================
+# COMPOSITION: NAMED BLOCKS WITH PARAMETERS
+# ============================================
+
+# Define a reusable block
+block review-pipeline:
+  parallel:
+    session "Security review"
+    session "Performance review"
+  session "Synthesize reviews"
+
+# Block with parameters
+block research(topic):
+  session "Research {topic}"
+  session "Summarize findings about {topic}"
+
+# Invoke with `do`
+do:
+  session "Write code"
+  do review-pipeline
+  session "Final edits"
+
+do research("quantum computing")
+
+# ============================================
+# LOOPS (with ** orchestrator discretion)
+# ============================================
+
+# Loop until condition (orchestrator evaluates **)
+loop until **approved**:
+  session "Write draft"
+  session "Get feedback"
+
+# Multi-word condition
+loop until **user is satisfied with the result**:
+  session "Propose solution"
+  session "Get feedback"
+
+# Repeat N times
+repeat 3:
+  session "Attempt solution"
+
+# Infinite loop (with runtime safeguards)
+loop:
+  session "Monitor for events"
+  session "Handle event"
+
+# For-each
+for item in items:
+  session "Process {item}"
+
+# ============================================
+# CHOICE (orchestrator discretion)
+# ============================================
+
+choice **based on urgency**:
+  session "Quick fix"
+  session "Thorough solution"
+
+# ============================================
+# PIPELINE OPERATIONS
+# ============================================
+
+# Map: transform each item
+items | map: session "Process {item}"
+
+# Filter: select items
+items | filter: session "Is {item} relevant?"
+
+# Reduce: accumulate results
+items | reduce(summary, item):
+  session "Add {item} to {summary}"
+
+# Chaining
+files
+  | filter: session "Is {item} relevant?"
+  | map: session "Extract info from {item}"
+  | reduce(report, info):
+      session "Add {info} to {report}"
+
+# Parallel map
+items | pmap: session "Process {item}"
+
+# ============================================
+# ERROR HANDLING
+# ============================================
+
+# Try/catch/finally
+try:
+  session "Risky operation"
+catch:
+  session "Handle failure"
+finally:
+  session "Cleanup"
+
+# Retry with backoff
+session "Flaky API call" (retry: 3)
+
+# ============================================
+# CONTEXT PASSING
+# ============================================
+
+# Variable binding (mutable)
+let research = session: researcher
+  prompt: "Research topic"
+
+# Variable binding (immutable)
+const config = session "Get configuration"
+
+# Explicit context
+session: writer
+  prompt: "Write about the research"
+  context: research
+
+# Multiple contexts
+session "Final synthesis":
+  context: [research, analysis, feedback]
+
+# No context (start fresh)
+session "Independent task":
+  context: []
+
+# ============================================
+# COMPLETE EXAMPLE
+# ============================================
+
+import "code-review" from "github:example/code-review"
+
+agent code-reviewer:
+  model: sonnet
+  skills: ["code-review"]
+
+agent synthesizer:
+  model: opus
+
+# Parallel review with named results
+parallel:
+  sec = session: code-reviewer
+    prompt: "Review for security issues"
+  perf = session: code-reviewer
+    prompt: "Review for performance issues"
+  style = session: code-reviewer
+    prompt: "Review for style issues"
+
+# Synthesize all results
+session: synthesizer
+  prompt: "Create unified review report"
+  context: { sec, perf, style }
+
+# Iterative refinement with ** condition
+loop until **approved**:
+  let draft = session "Improve based on feedback"
+  let feedback = session "Get stakeholder review"
+    context: draft