diff --git a/docs/designs/observability/compass-observability-architecture/design.md b/docs/designs/observability/compass-observability-architecture/design.md
index e5872685..83960c7c 100644
--- a/docs/designs/observability/compass-observability-architecture/design.md
+++ b/docs/designs/observability/compass-observability-architecture/design.md
@@ -67,6 +67,9 @@ instrumentation **T1 owns** on the write path (distinct from T4b's OTel
 telemetry: billing compute cannot be derived from traces any more than from
 token counts).
 
+[SATISFIED (RIG-1715): the gateway record has landed; see the Plan's
+prerequisite note.]
+
 **Store and read path.** Usage/spend events land in Postgres rollup tables in
 the compass-server store (the store today is a single squashed migration,
 `go/internal/store/migrations/0001_init.sql:1-8`), behind an append-only write
@@ -505,6 +508,9 @@ Grafana) is the posture Matt explicitly declined.
 yet): bundling the OMP gateway into the Server.** The gateway is the Class-2
 event source; T1-T3 depend on it. Its design record must land first.
 
+[SATISFIED (RIG-1715): that record has since landed at
+`docs/designs/server/compass-server-llm-gateway/design.md`.]
+
 **Out of scope (managed-plane — named, deferred):** the managed control
 plane — cross-tenant analytics and aggregate observability, billing, any
 OLAP-backend adoption (Class 3), tenant scheduling, per-tenant telemetry export.
@@ -539,6 +545,8 @@ Interfaces:
   today) and **token-usage** events from the bundled OMP gateway (the upstream
   prerequisite); the existing store open/migration machinery behind
   `0001_init.sql`.
+- Since (RIG-1715): the token-usage events are that record's
+  `TokenUsageEvent`, emitted by its T4 into the `UsageStore` this task owns.
 - Produces: a **`UsageStore` interface** over an append-only event write plus
   rollup/series reads (keyed by tenant × account × window), with a Postgres
   implementation as the sole backend the core ships, plus an in-memory reference.
@@ -587,6 +595,8 @@ Interfaces:
   {bucket, tokensIn, tokensOut, cost}`), regenerated Go + TS clients via
   `moon run compass-proto:gen`; tenant scope enforced server-side, never
   client-supplied trust.
+- Correction: these RPCs are superseded by RIG-1715 `UsageService` — one
+  service, so there is no duplicate proto surface to add here.
 
 ### T3 — In-app charts (Plane A UI)
 
@@ -602,6 +612,9 @@ time-series charts are needed.
 Interfaces:
 
 - Consumes: T2's generated `@compass/client` RPCs.
+- Correction (RIG-1715): those RPCs are `UsageService.GetUsageSeries` and
+  `GetProviderQuota`, consumed directly — T2 adds no usage surface of its
+  own, so the series JSON below comes from `GetUsageSeries`, not T2.
 - Produces: `UsageBar` reading live per-account usage (replacing the
   `STUB_USAGE` import); a usage/spend view rendering T2's time-series JSON.
 
@@ -679,6 +692,9 @@ code. **Track A (Plane A) is blocked** on the undesigned OMP-gateway-into-Server
 prerequisite. Execute Track B first; Track A unblocks when the gateway record
 lands.
 
+[UNBLOCKED (RIG-1715): the gateway record has landed, so Track A's
+prerequisite is met.]
+
 Track B — unblocked (do first):
 
 - [ ] T4 — Plane-B fan-in collector (Owner: compass-server/distribution) —
@@ -692,8 +708,14 @@ Track B — unblocked (do first):
 
 Track A — blocked on the OMP-gateway prerequisite:
 
+[UNBLOCKED (RIG-1715): the gateway record has landed, so the prerequisite is
+met. T1 is executable now; T3 additionally waits on that record's T4 shipping
+the UsageService RPCs. T2 is superseded — see its entry below.]
+
 - [ ] PREREQUISITE (upstream, not a task here — write its design record FIRST):
       OMP-gateway-into-Server — gates T1-T3.
+      SATISFIED (RIG-1715) by the LLM-gateway record,
+      `docs/designs/server/compass-server-llm-gateway/design.md`.
 - [ ] T1 — Usage/event store + write contract (Owner: compass-server) — the
       runtime compute-usage accounting instrumentation (new in `go/`) + two
       append-only event kinds (compute-usage = billing-grade from the runtime;
@@ -702,6 +724,8 @@ Track A — blocked on the OMP-gateway prerequisite:
 - [ ] T2 — Tenant-scoped read gRPC (Owner: compass-server) — `compass.v1`
       schema change (fixed granularity enum) + regenerated clients + server-side
       tenant scoping.
+      SUPERSEDED (RIG-1715): the usage RPCs merge into that record's
+      `UsageService`; no `compass.v1` usage surface to add here.
 - [ ] T3 — In-app charts (Owner: compass-ui) — UsageBar wired to live data,
       then time-series usage/spend views, native Solid rendering.
 - [ ] T6 — PostHog embed + correlation-key join seam (Owner: compass-ui +