docs: close out milestone 8 and set milestone 9 as current

docs/PROGRESS.md

@@ -124,9 +124,9 @@ Planned Scope:
 
 ## Milestone 8 - Profile and Session UX Completion
 
-Status: In Progress
+Status: Completed
 
-Started:
+Delivered:
 - Added profile `tags` field to storage + schema migration and profile editor UX
 - Added profile `folder_path` field + nested folder/subfolder profile view mode
 - Added profile tree context actions (`New Folder`, `New Connection`) and drag-to-folder profile moves with persistence
@@ -140,10 +140,12 @@ Started:
 - Persisted session UI defaults (`terminal theme`, `events panel visibility`) for new tabs/windows
 - Added profile quick filters (`Protocol`, `Tag`) with persistence to speed profile browsing
 
-Planned Scope:
-- Complete protocol-aware profile validation and UX polish
-- Add/persist session UI preferences and default behaviors
-- Improve events/diagnostics visibility for long-running session usage
+Validation:
+- Local build verification passed (`cmake --build build`)
+- No automated tests are currently configured in CTest
+
+Git:
+- Tag: Pending user approval (`v0-m8-done`)
 
 ## Milestone 9 - Packaging and Distribution