docs: Windows support in README + CHANGELOG (v0.9.1.1)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.9.1.1] - 2026-03-20
+
+### Fixed
+
+- **gstack now works on Windows 11.** Setup no longer hangs, and the browse server automatically falls back to Node.js to work around a Bun pipe-handling bug on Windows. Just make sure Node.js is installed alongside Bun. macOS and Linux are completely unaffected. (Thanks @sozairali — PR #194)
+
 ## [0.9.1.0] - 2026-03-20 — Adversarial Spec Review + Skill Chaining
 
 ### Added

README.md

@@ -42,7 +42,7 @@ Expect first useful run in under 5 minutes on any repo with tests already set up
 
 ## Install — takes 30 seconds
 
-**Requirements:** [Claude Code](https://docs.anthropic.com/en/docs/claude-code), [Git](https://git-scm.com/), [Bun](https://bun.sh/) v1.0+
+**Requirements:** [Claude Code](https://docs.anthropic.com/en/docs/claude-code), [Git](https://git-scm.com/), [Bun](https://bun.sh/) v1.0+, [Node.js](https://nodejs.org/) (Windows only)
 
 ### Step 1: Install on your machine
 
@@ -238,6 +238,8 @@ Data is stored in [Supabase](https://supabase.com) (open source Firebase alterna
 
 **Stale install?** Run `/gstack-upgrade` — or set `auto_upgrade: true` in `~/.gstack/config.yaml`
 
+**Windows users:** gstack works on Windows 11 via Git Bash or WSL. Node.js is required in addition to Bun — Bun has a known bug with Playwright's pipe transport on Windows ([bun#4253](https://github.com/oven-sh/bun/issues/4253)). The browse server automatically falls back to Node.js. Make sure both `bun` and `node` are on your PATH.
+
 **Claude says it can't see the skills?** Make sure your project's `CLAUDE.md` has a gstack section. Add this:
 
 ```

VERSION

@@ -1 +1 @@
-0.9.1.0
+0.9.1.1