ci(nests): drop hang-interop job from build.yml

Per maintainer ask: keep the cross-stack interop suite out of CI
for now. The full HangInteropTest suite shows ~33% flake on
late_join_listener_still_decodes_tail (catalog-cancelled race
between the speaker's setOnNewSubscriber hook and the listener's
catalog subscribe-bidi) that the per-method resetShared() fix
doesn't fully resolve. CI'ing a flaky suite is net-negative.

Suite still runs locally via -DnestsHangInterop=true. Results plan
updated to reflect the 'not wired' status with a re-evaluation
trigger (root-cause the late-join flake first).

.github/workflows/build.yml

@@ -174,71 +174,6 @@ jobs:
           name: ${{ matrix.desktop-artifact-name }}
           path: ${{ matrix.desktop-artifact-path }}
 
-  # Cross-stack interop tests (T16). Builds the Rust hang-listen +
-  # hang-publish sidecars (nestsClient/tests/hang-interop/), `cargo install`s
-  # moq-relay + moq-token-cli at the version pinned in
-  # `nestsClient/tests/hang-interop/REV`, then runs `:nestsClient:jvmTest
-  # -DnestsHangInterop=true`. See
-  # `nestsClient/plans/2026-05-06-cross-stack-interop-test.md`.
-  #
-  # Linux-only: the cargo install of `moq-relay` 0.10.x has nontrivial
-  # native deps (aws-lc-sys, ring) that take 5+ min cold; we cache
-  # both ~/.cargo and the nestsClient/tests/hang-interop/target tree so the warm
-  # path is a few seconds. macOS / Windows runs would double the
-  # matrix cost without catching anything Linux doesn't catch — the
-  # protocol logic is platform-agnostic and the JNA libopus natives
-  # are already exercised by the unit-level JvmOpusRoundTripTest on
-  # the Android job.
-  hang-interop:
-    needs: lint
-    runs-on: ubuntu-latest
-    timeout-minutes: 30
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v6
-
-      - name: Set up JDK 21
-        uses: actions/setup-java@v5
-        with:
-          distribution: 'zulu'
-          java-version: 21
-
-      - name: Set up Gradle
-        uses: gradle/actions/setup-gradle@v4
-        with:
-          cache-read-only: ${{ github.ref != 'refs/heads/main' }}
-
-      # Pin Rust to ≥ 1.95 — moq-relay 0.10.25's transitive dep
-      # `constant_time_eq 0.4.3` requires it, and ubuntu-latest's
-      # default Rust version drifts.
-      - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
-
-      # Cache cargo registry + the sidecar workspace's target/.
-      # First cold run takes ~6 min for the moq-relay install;
-      # cached runs ~30 s.
-      - name: Cache cargo
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            nestsClient/tests/hang-interop/target
-            ~/.cache/amethyst-nests-interop/hang-interop-cargo
-          key: ${{ runner.os }}-cargo-${{ hashFiles('nestsClient/tests/hang-interop/Cargo.lock', 'nestsClient/tests/hang-interop/REV') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-
-
-      - name: Run cross-stack interop suite
-        run: ./gradlew :nestsClient:jvmTest -DnestsHangInterop=true
-
-      - name: Upload interop test report
-        uses: actions/upload-artifact@v7
-        if: failure()
-        with:
-          name: Hang Interop Test Reports
-          path: nestsClient/build/reports/tests/jvmTest/
-
   test-and-build-android:
     needs: lint
     runs-on: ubuntu-latest