fix(android): retain HTTPS sessions with upstream default cookie flags

Reproduce browser-success/native-401 with unmodified upstream SESSION_SECURE=false behind HTTPS. Keep cookies in the existing HTTPS-only origin-bound encrypted jar regardless of the server Secure attribute; preserve TLS, redirect, expiry and origin protections. Distinguish credential/2FA rejection from missing/rejected session handoff and clear stale login errors on retry. Verify 13 JVM tests plus the 7-test real-server suite in both Secure/default-cookie modes, including bad-password then successful native login. Bump Android preview to 0.2.1/code 3; extend CI and document the defect without claiming access to the user's production server.

docs/native-delivery-report.md

@@ -4,6 +4,11 @@
 This report closes the initial native rebuild slice, not the requested complete
 1:1 replacement. No module has accepted functional and visual parity.
 
+**Follow-up:** Android 0.2.1 native preview (code 3) fixes a reproduced session-cookie
+login compatibility defect. See [login troubleshooting](login-troubleshooting.md)
+and the newer [validation evidence](validation.md); the original 0.2.0 results
+below remain historical evidence, not a replacement for the fixed APK.
+
 ## 1. Outcome
 
 The rejected embedded-browser application has been replaced by genuine native