docs(plan): 📝 mark all cycle 19 plan tasks as completed

Author: hletrd

plan/cycle19-plan.md

@@ -64,6 +64,8 @@ User explicitly requested "Fix ALL deferred items." Each deferred item re-evalua
 
 | Task | Finding | Status | Commit |
 |-------|---------|--------|--------|
-| 1 | C19-F02 | PENDING | |
-| 2 | C19-F05 | PENDING | |
-| 3 | C19-F01 | PENDING | |
+| 1 | C19-F02 | COMPLETED | 1b8699f |
+| 2 | C19-F05 | COMPLETED | 33d131e |
+| 3 | C19-F01 | COMPLETED | 5bd74de |
+
+All 4 quality gates pass: lint, typecheck, build, test (112 tests passing).