v1.91.4.0 fix: Windows Opera cookie import wave (#2980, refs #2957) (#2987)

* fix: support Windows Opera and Opera GX cookie imports

Fixes #2957

* fix: repair Windows cookie decryption and make Opera import failures actionable

- strip the SHA-256(host_key) prefix Chromium adds to v10 values (DB meta v24+) on Windows
- keep receipts and name `$B handoff` recovery for App-Bound rows in browsers without native extraction
- explain missing browsers, missing profiles and ambiguous profile selection with next steps
- add windowsNative/resolveBrowserInfo, the operagx alias and sorted failure reasons in CLI output
- cover the Node server runtime with a real-DPAPI Windows test

* docs: document Windows Opera cookie import and guard browser lists against drift

* chore: file cookie-import follow-ups from the Opera fix wave review

* test: keep Opera receipt tests independent of the shared key cache

* test: declare generated gstack/llms.txt as a command-reference input for PR selection

* chore: release v1.91.4.0

* test: reconstruct the historical cookie-workflow approval after the Opera BROWSER.md additions

* test: run the real-DPAPI Windows check with the runner's environment

PowerShell launched with a stripped environment took ~18-21s on the Windows
runner (measured on a throwaway diagnostics run), past dpapiDecrypt's 10s
deadline; with the full environment it returns in ~0.3s. Only APPDATA is
redirected to the fixture's Opera root.

---------

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>

test/cookie-workflow-manual-review.test.ts

@@ -16,7 +16,7 @@ function fixture() {
   for (const file of [COOKIE_MANUAL_REVIEW_FILE, 'setup-browser-cookies/SKILL.md', 'BROWSER.md']) {
     const target = join(root, file); mkdirSync(resolve(target, '..'), { recursive: true });
     const source = readFileSync(join(ROOT, file), 'utf8');
-    writeFileSync(target, file === 'setup-browser-cookies/SKILL.md' ? approvedCookieWorkflowSource(source) : source);
+    writeFileSync(target, file === COOKIE_MANUAL_REVIEW_FILE ? source : approvedCookieWorkflowSource(source));
   }
   const entry = manualReviewFixture(root);
   const approval = entry.manual_review!.approval;