diff --git a/.project/objectives/p1-27a-mcts-service-telemetry.md b/.project/objectives/p1-27a-mcts-service-telemetry.md
index 2fe60d10..e042a3e0 100644
--- a/.project/objectives/p1-27a-mcts-service-telemetry.md
+++ b/.project/objectives/p1-27a-mcts-service-telemetry.md
@@ -2,18 +2,16 @@
 id: p1-27a
 title: MCTS service telemetry + parity test + huge-map wiring
 priority: p1
-status: missing
+status: in_progress
 scope: game1
 owner: warcouncil
-updated_at: 2026-05-14
-parent: p1-27
+updated_at: 2026-05-16
 evidence:
   - src/simulator/crates/mc-mcts-service/src/server.rs
   - src/simulator/crates/mc-mcts-service/src/bin/mcts-server.rs
   - tools/huge-map-5clan.sh
   - tools/run-services.sh
 ---
-
 ## Summary
 
 Split out of `p1-27` (architectural extraction, closed `done` 2026-05-14). The
diff --git a/src/simulator/crates/mc-ai/Cargo.toml b/src/simulator/crates/mc-ai/Cargo.toml
index 6e893344..49f98e79 100644
--- a/src/simulator/crates/mc-ai/Cargo.toml
+++ b/src/simulator/crates/mc-ai/Cargo.toml
@@ -11,6 +11,11 @@ default = []
 # unconditionally and is part of the public API, consumed by both the CPU
 # rollout path (Task C4) and the GPU rollout path (Tasks C3/C4).
 gpu = ["dep:wgpu", "dep:pollster"]
+# Opt-in test-fixture exports (p1-27a). Exposes `mc_ai::test_fixtures` —
+# the 5-clan personality priors + `fixture_batch` deterministic builder used
+# by `gpu_rollout_parity.rs` (in-crate) and `mc-mcts-service`'s
+# `parity_via_service.rs` (cross-crate). Non-default: prod builds stay clean.
+test-fixtures = []
 
 [dependencies]
 mc-core      = { path = "../mc-core" }