chore: bump version and changelog (v0.5.1)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.5.1 — 2026-03-17
+
+- **Know where you stand before you ship.** Every `/plan-ceo-review`, `/plan-eng-review`, and `/plan-design-review` now logs its result to a review tracker. At the end of each review, you see a **Review Readiness Dashboard** showing which reviews are done, when they ran, and whether they're clean — with a clear CLEARED TO SHIP or NOT READY verdict.
+- **`/ship` checks your reviews before creating the PR.** Pre-flight now reads the dashboard and asks if you want to continue when reviews are missing. Informational only — it won't block you, but you'll know what you skipped.
+- **One less thing to copy-paste.** The SLUG computation (that opaque sed pipeline for computing `owner-repo` from git remote) is now a shared `bin/gstack-slug` helper. All 14 inline copies across templates replaced with `eval $(gstack-slug)`. If the format ever changes, fix it once.
+
+### For contributors
+
+- Added `{{REVIEW_DASHBOARD}}` resolver to `gen-skill-docs.ts` — shared dashboard reader injected into 4 templates (3 review skills + ship).
+- Added `bin/gstack-slug` helper (5-line bash) with unit tests. Outputs `SLUG=` and `BRANCH=` lines, sanitizes `/` to `-`.
+- New TODOs: smart review relevance detection (P3), `/merge` skill for review-gated PR merge (P2).
+
 ## 0.5.0 — 2026-03-16
 
 - **Your site just got a design review.** `/plan-design-review` opens your site and reviews it like a senior product designer — typography, spacing, hierarchy, color, responsive, interactions, and AI slop detection. Get letter grades (A-F) per category, a dual headline "Design Score" + "AI Slop Score", and a structured first impression that doesn't pull punches.