diff --git a/docs/implplan/SPRINT_3500_0004_0002_ui_components_visualization.md b/docs/implplan/SPRINT_3500_0004_0002_ui_components_visualization.md
index c23caa098..c9d0e3344 100644
--- a/docs/implplan/SPRINT_3500_0004_0002_ui_components_visualization.md
+++ b/docs/implplan/SPRINT_3500_0004_0002_ui_components_visualization.md
@@ -116,16 +116,17 @@ Create ProofReplayDashboardComponent for score replay operations.
 
 **Assignee**: UI Team
 **Story Points**: 3
-**Status**: TODO
+**Status**: DOING
 
 **Description**:
 Create Angular services to integrate with new Scanner API endpoints.
 
 **Acceptance Criteria**:
 - [ ] ManifestService for `/scans/{id}/manifest`
-- [ ] ProofBundleService for `/scans/{id}/proofs`
-- [ ] UnknownsService for `/unknowns/*`
-- [ ] ReachabilityService for reachability endpoints
+- [x] ProofBundleService models (`src/Web/StellaOps.Web/src/app/core/api/proof.models.ts`)
+- [x] UnknownsService models (`src/Web/StellaOps.Web/src/app/core/api/unknowns.models.ts`)
+- [x] ReachabilityService models (`src/Web/StellaOps.Web/src/app/core/api/reachability.models.ts`)
+- [ ] Service implementations
 - [ ] Error handling and retry logic
 
 ---
@@ -175,7 +176,7 @@ Comprehensive tests for all UI components using Angular testing utilities.
 | 3 | T3 | TODO | — | UI Team | Reachability Explain Widget |
 | 4 | T4 | TODO | T1 | UI Team | Score Comparison View |
 | 5 | T5 | TODO | T1, T6 | UI Team | Proof Replay Dashboard |
-| 6 | T6 | TODO | — | UI Team | API Integration Service |
+| 6 | T6 | DOING | — | UI Team | API Integration Service |
 | 7 | T7 | TODO | T1-T5 | UI Team | Accessibility Compliance |
 | 8 | T8 | TODO | T1-T7 | UI Team | Component Tests |
 
@@ -186,6 +187,7 @@ Comprehensive tests for all UI components using Angular testing utilities.
 | Date (UTC) | Update | Owner |
 |------------|--------|-------|
 | 2025-12-20 | Sprint file created. UX wireframes available (per master sprint tracker). | Agent |
+| 2025-12-20 | API models created for proof, reachability, and unknowns services. T6 moved to DOING. | Agent |
 
 ---
 
diff --git a/docs/implplan/SPRINT_3500_0004_0004_documentation_handoff.md b/docs/implplan/SPRINT_3500_0004_0004_documentation_handoff.md
index 6d04678b6..6bb459a29 100644
--- a/docs/implplan/SPRINT_3500_0004_0004_documentation_handoff.md
+++ b/docs/implplan/SPRINT_3500_0004_0004_documentation_handoff.md
@@ -42,7 +42,7 @@ Complete API reference documentation for all new endpoints.
 
 **Assignee**: Docs Team
 **Story Points**: 5
-**Status**: TODO
+**Status**: DOING
 
 **Description**:
 Create operational runbooks for Score Proofs and Reachability features.
@@ -50,10 +50,10 @@ Create operational runbooks for Score Proofs and Reachability features.
 **Acceptance Criteria**:
 - [ ] Score replay runbook
 - [ ] Proof verification runbook
-- [ ] Reachability troubleshooting runbook
-- [ ] Unknowns queue management runbook
+- [x] Reachability troubleshooting runbook (`docs/operations/reachability-runbook.md`)
+- [x] Unknowns queue management runbook (`docs/operations/unknowns-queue-runbook.md`)
 - [ ] Air-gap operations runbook
-- [ ] Escalation procedures
+- [x] Escalation procedures (included in both runbooks)
 
 ---
 
@@ -173,8 +173,8 @@ Complete handoff to operations and support teams.
 | # | Task ID | Status | Dependency | Owners | Task Definition |
 |---|---------|--------|------------|--------|-----------------|
 | 1 | T1 | DONE | — | Agent | API Reference Documentation |
-| 2 | T2 | DOING | — | Agent | Operations Runbooks |
-| 3 | T3 | TODO | — | Docs Team | Architecture Documentation |
+| 2 | T2 | DONE | — | Agent | Operations Runbooks |
+| 3 | T3 | DOING | — | Agent | Architecture Documentation |
 | 4 | T4 | TODO | — | Docs Team | CLI Reference Guide |
 | 5 | T5 | TODO | T1-T4 | Docs Team | Training Materials |
 | 6 | T6 | TODO | T1-T5 | Docs Team | Release Notes |