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/CHANGELOG.md

@@ -5,6 +5,18 @@ All notable changes to the compound-engineering plugin will be documented in thi
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.38.0] - 2026-03-08
+
+### Added
+
+- **`/essay-outline` command** - Transform a brain dump into a story-structured essay outline. Pressure tests ideas for a real thesis and payoff, applies the Saunders storytelling framework (via `story-lens` skill) to validate hook, escalation, and conclusion, then produces a tight outline written to file.
+
+## [2.37.0] - 2026-03-08
+
+### Added
+
+- **`story-lens` skill** - Evaluate prose quality using George Saunders's storytelling framework (beat causality, escalation, three E's, character accumulation, moral/technical unity)
+
 ## [2.36.0] - 2026-02-27
 
 ### Added