chore: bump version and changelog (v0.9.3.0)

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

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [0.9.3.0] - 2026-03-20 — Windows Support
+
+### Fixed
+
+- **gstack now works on Windows 11.** Setup no longer hangs when verifying Playwright, and the browse server automatically falls back to Node.js to work around a Bun pipe-handling bug on Windows ([bun#4253](https://github.com/oven-sh/bun/issues/4253)). Just make sure Node.js is installed alongside Bun. macOS and Linux are completely unaffected.
+- **Path handling works on Windows.** All hardcoded `/tmp` paths and Unix-style path separators now use platform-aware equivalents via a new `platform.ts` module. Path traversal protection works correctly with Windows backslash separators.
+
+### Added
+
+- **Bun API polyfill for Node.js.** When the browse server runs under Node.js on Windows, a compatibility layer provides `Bun.serve()`, `Bun.spawn()`, `Bun.spawnSync()`, and `Bun.sleep()` equivalents. Fully tested.
+- **Node server build script.** `browse/scripts/build-node-server.sh` transpiles the server for Node.js, stubs `bun:sqlite`, and injects the polyfill — all automated during `bun run build`.
+
 ## [0.9.2.0] - 2026-03-20 — Gemini CLI E2E Tests
 
 ### Added

VERSION

@@ -1 +1 @@
-0.9.2.0
+0.9.3.0