v1.34.1.0 fix: gstack-update-check resists stale GitHub raw CDN + adds semver-order guard (#1475)

* fix: gstack-update-check resolves remote VERSION via SHA-pinned URL

Replace branch-raw fetch with git ls-remote + SHA-pinned raw URL. Add
semver-order guard via sort -V so REMOTE < LOCAL stays silent instead
of emitting a backwards UPGRADE_AVAILABLE line. Fence git ls-remote
with GIT_TERMINAL_PROMPT=0 + 5s low-speed timeout. Honor explicit
GSTACK_REMOTE_URL overrides for test fixtures and private mirrors.

3 new tests cover stale-CDN regression, multi-segment 1.9 vs 1.10
both directions.

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

* chore: bump version and changelog (v1.34.1.0)

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

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "1.34.0.0",
+  "version": "1.34.1.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",