chore: bump version and changelog (v0.11.20.0)

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

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.11.20.0] - 2026-03-26
+
+### Added
+
+- **GitLab support for `/retro` and `/ship`.** You can now run `/ship` on GitLab repos — it creates merge requests via `glab mr create` instead of `gh pr create`. `/retro` detects default branches on both platforms. All 11 skills using `BASE_BRANCH_DETECT` automatically get GitHub, GitLab, and git-native fallback detection.
+- **GitHub Enterprise and self-hosted GitLab detection.** If the remote URL doesn't match `github.com` or `gitlab`, gstack checks `gh auth status` / `glab auth status` to detect authenticated platforms — no manual config needed.
+- **`/document-release` works on GitLab.** After `/ship` creates a merge request, the auto-invoked `/document-release` reads and updates the MR body via `glab` instead of failing silently.
+- **GitLab safety gate for `/land-and-deploy`.** Instead of silently failing on GitLab repos, `/land-and-deploy` now stops early with a clear message that GitLab merge support is not yet implemented.
+
+### Fixed
+
+- **Deduplicated gen-skill-docs resolvers.** The template generator had duplicate inline resolver functions that shadowed the modular versions, causing generated SKILL.md files to miss recent resolver updates.
+
 ## [0.11.19.0] - 2026-03-24
 
 ### Fixed

VERSION

@@ -1 +1 @@
-0.11.19.0
+0.11.20.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.11.19.0",
+  "version": "0.11.20.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",