chore: bump to v1.9.0.0 for gbrain-sync landing

Changes just the VERSION + package.json + CHANGELOG header (1.7.0.0 → 1.9.0.0
and date 2026-04-22 → 2026-04-23). No code changes. User call: land gbrain-sync
as a bigger-signal release above main's 1.6.4.0, skipping 1.8.0.0.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## [1.7.0.0] - 2026-04-22
+## [1.9.0.0] - 2026-04-23
 
 ## **Your gstack memory now travels with you. Cross-machine brain via a private git repo + optional GBrain indexing, no daemon, no credential leaks.**
 

VERSION

@@ -1 +1 @@
-1.7.0.0
+1.9.0.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "1.7.0.0",
+  "version": "1.9.0.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",