TASK-052-004: Verify all using directives updated (RFC9114/RFC9204/RFC9000 → Http3)

All consumer `using` directives were updated as part of TASK-052-002 and TASK-052-003.
Verified no `using TurboHttp.Protocol.RFC9114;`, `using TurboHttp.Protocol.RFC9204;`,
or `using TurboHttp.Protocol.RFC9000;` remain anywhere in the solution.
Feature 052 acceptance criteria for TASK-052-004 marked complete.

Author: st0o0

.maggus/features/feature_052.md .maggus/features/feature_052_completed.md.maggus/features/feature_052.md renamed to .maggus/features/feature_052_completed.md

@@ -141,10 +141,10 @@ new `Http3` or `Http3.Qpack` namespace so that the solution compiles.
 **Parallel:** no
 
 **Acceptance Criteria:**
-- [ ] No `using TurboHttp.Protocol.RFC9114;` anywhere in the solution
-- [ ] No `using TurboHttp.Protocol.RFC9204;` anywhere in the solution
-- [ ] No `using TurboHttp.Protocol.RFC9000;` anywhere in the solution
-- [ ] All Http3 Streams stages, engines, and test files import the new namespaces
-- [ ] No logic changes — only `using` directive updates
+- [x] No `using TurboHttp.Protocol.RFC9114;` anywhere in the solution
+- [x] No `using TurboHttp.Protocol.RFC9204;` anywhere in the solution
+- [x] No `using TurboHttp.Protocol.RFC9000;` anywhere in the solution
+- [x] All Http3 Streams stages, engines, and test files import the new namespaces
+- [x] No logic changes — only `using` directive updates
 
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