diff --git a/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md b/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md
index 073b16c1..4d563131 100644
--- a/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md
+++ b/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md
@@ -316,7 +316,7 @@ Critical path ≈ 1B: **~4–6 weeks total**, matching the design estimate.
 - [ ] 1A DoD: rig site-a on `Grpc` proves all 5 site→central paths while site-b/c stay Akka; PR merged (before 1B)
 
 **Phase 1B — site command plane** (worktree, `feat/grpc-sitecommand`)
-- [ ] T1B.1 `site_command.proto` (6 oneof RPCs / 28 commands) + `SiteCommandDtoMapper` + round-trip golden tests (all 28 + replies)
+- [x] T1B.1 `site_command.proto` (6 oneof RPCs / 28 commands) + `SiteCommandDtoMapper` + round-trip golden tests (all 28 + replies)
 - [ ] T1B.2 `SiteCommandDispatcher` refactor (actor + new `SiteCommandGrpcService` share it; parked stays node-local)
 - [ ] T1B.3 `ISiteCommandTransport` in `CentralCommunicationActor` (Akka extract + Grpc impl), `SitePairChannelProvider` (Site entity Grpc columns + DB refresh loop), `SiteTransport` flag default `Akka`
 - [ ] T1B.4 Tests: dispatcher routing ×28, actor envelope/reply plumbing, TestServer service tests, existing Communication suites green
diff --git a/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.tasks.json b/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.tasks.json
index df4bbe78..b7bce87a 100644
--- a/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.tasks.json
+++ b/docs/plans/2026-07-22-clusterclient-to-grpc-plan.md.tasks.json
@@ -139,17 +139,18 @@
       "id": "T1B.1",
       "phase": "1B",
       "subject": "site_command.proto (6 oneof RPCs / 28 commands) + SiteCommandDtoMapper + round-trip golden tests",
-      "status": "in_progress",
+      "status": "completed",
       "activeForm": "Authoring site_command.proto and its mappers",
       "blockedBy": [
         "P0.DoD"
-      ]
+      ],
+      "notes": "a7481174 on feat/grpc-sitecommand. 6 oneof RPCs / 28 commands / 22 replies / 18 nested, verified by reflection guards not a hand list. PLAN CORRECTIONS: (1) generic Guid?->empty-string-means-null is UNSAFE for RouteToWaitForAttributeRequest.TargetValueEncoded, a nullable STRING where '' is a real wait target distinct from null - gave it a StringValue wrapper; (2) RouteToGetAttributesResponse.Values is NON-nullable dict but RouteToCallRequest.Parameters is nullable - two decode paths (absent->empty vs absent->null); (3) DeployArtifactsCommand has 6 NULLABLE artifact collections, proto3 repeated collapses null<->empty => wrapper messages (PLAN-05 T8 class); (4) AlarmStateChanged.Condition is derived-on-read over a nullable backing field - encoding unconditionally breaks record equality, mapper omits condition==computed default. Added seam types for T1B.2/3: SiteCommandGroup, GroupOf/GroupOfReply, UnsubscribeDebugViewAck marker (unsubscribe is Tell today, unary RPC must answer). REBASE NOTE: union-conflict expected in Communication.csproj commented Protobuf ItemGroup + docker/regen-proto.sh vs 1A."
     },
     {
       "id": "T1B.2",
       "phase": "1B",
       "subject": "SiteCommandDispatcher refactor (actor + SiteCommandGrpcService share it; parked stays node-local)",
-      "status": "pending",
+      "status": "in_progress",
       "activeForm": "Extracting the site command dispatcher",
       "blockedBy": [
         "T1B.1"