docs(phase-12): resolve UAT gaps and close phase after 12-06 gap closure

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

.planning/phases/12-cloud-resource-foundation/12-UAT.md

@@ -1,5 +1,5 @@
 ---
-status: diagnosed
+status: resolved
 phase: 12-cloud-resource-foundation
 source:
   - 12-01-SUMMARY.md
@@ -8,7 +8,7 @@ source:
   - 12-04-SUMMARY.md
   - 12-05-SUMMARY.md
 started: 2026-06-19T20:21:31+02:00
-updated: 2026-06-21T22:17:40+02:00
+updated: 2026-06-21T23:59:00+02:00
 ---
 
 ## Current Test
@@ -69,7 +69,7 @@ blocked: 3
 ## Gaps
 
 - truth: "Each cloud connection is addressed by its UUID, and a user can create and manage multiple independent connections for the same provider."
-  status: failed
+  status: resolved
   reason: "User reported that a successfully connected Nextcloud account opens as HTTP 422 and that a second Nextcloud connection cannot be added."
   severity: blocker
   test: 2
@@ -91,7 +91,7 @@ blocked: 3
   debug_session: ""
 
 - truth: "Cloud navigation identifies the active connection/folder and exposes a working Cloud > connection > folder hierarchy."
-  status: failed
+  status: resolved
   reason: "User reported that Cloud cannot be clicked from a failed connection, the generic Cloud Storage sidebar entry stays highlighted, connection/folder nodes are not highlighted, and the breadcrumb hierarchy is incomplete."
   severity: major
   test: 3