feat(commands): add /essay-outline command

Transforms a brain dump into a story-structured essay outline.
Pressure tests for a real thesis, applies the Saunders framework
via story-lens skill to validate hook, escalation, and conclusion,
then writes a tight outline to file.

Also fixes stale skill count in README (22 → 24).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/compound-engineering/README.md

@@ -7,8 +7,8 @@ AI-powered development tools that get smarter with every use. Make each unit of
 | Component | Count |
 |-----------|-------|
 | Agents | 25 |
-| Commands | 23 |
-| Skills | 22 |
+| Commands | 24 |
+| Skills | 24 |
 | MCP Servers | 1 |
 
 ## Agents
@@ -96,6 +96,7 @@ Core workflow commands use `workflows:` prefix to avoid collisions with built-in
 | `/agent-native-audit` | Run comprehensive agent-native architecture review |
 | `/deploy-docs` | Validate and prepare documentation for GitHub Pages |
 | `/pr-comments-to-todos` | Fetch PR comments and convert to todo files |
+| `/essay-outline` | Transform a brain dump into a story-structured essay outline |
 
 ## Skills
 
@@ -129,6 +130,7 @@ Core workflow commands use `workflows:` prefix to avoid collisions with built-in
 | `john-voice` | Write content in John Lamb's authentic voice across all venues |
 | `resolve-pr-parallel` | Resolve PR review comments in parallel |
 | `setup` | Configure which review agents run for your project |
+| `story-lens` | Evaluate prose quality using George Saunders's storytelling framework |
 | `upstream-merge` | Incorporate upstream git changes while preserving local fork intent |
 
 ### Multi-Agent Orchestration