ci(nests): drop hang-interop + browser-interop jobs from build.yml

Per maintainer ask: keep cross-stack interop suites out of CI for
now. Both jobs ran ./gradlew :nestsClient:jvmTest with Hang and/or
Browser interop opt-ins enabled, but the underlying HangInteropTest
suite shows ~33% flake on late_join_listener_still_decodes_tail
that the per-method resetShared() fix doesn't fully resolve. CI'ing
flaky suites is net-negative.

Suites still run locally:
  ./gradlew :nestsClient:jvmTest -DnestsHangInterop=true
  ./gradlew :nestsClient:jvmTest -DnestsHangInterop=true \
      -DnestsBrowserInterop=true \
      --tests '*BrowserInteropTest'

Re-evaluate CI gating after the late-join flake's root cause lands.

.github/workflows/build.yml

@@ -174,162 +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/
-
-  # Phase 4 of T16: browser-side cross-stack interop. Drives a headless
-  # Chromium (via Playwright) running @moq/lite + @moq/hang against
-  # the same moq-relay subprocess the hang-interop job uses. Linux-only:
-  # Chromium QUIC behaviour is consistent across platforms in the
-  # scenarios we care about, and macOS/Windows would double the matrix
-  # cost without catching new defects.
-  #
-  # Inherits the cargo cache from `hang-interop` because the browser
-  # path still needs `moq-relay` + `hang-listen` built (the harness
-  # boots the same Rust subprocess). Adds bun + node_modules + Playwright
-  # browser caches. See:
-  #   nestsClient/plans/2026-05-06-phase4-browser-harness.md
-  browser-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' }}
-
-      - name: Set up Rust
-        uses: dtolnay/rust-toolchain@stable
-
-      - 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-
-
-      # bun is a separate install — Playwright + the bun harness build
-      # both go through it. Pin the version that matches the local agent
-      # tooling so a CI/local skew can't surface a wire-format change
-      # in `bun build` output.
-      - name: Set up bun
-        uses: oven-sh/setup-bun@v2
-        with:
-          bun-version: 1.3.11
-
-      # Cache bun-installed node_modules for the browser harness.
-      # Keyed on package.json + bun.lock so a dep bump invalidates.
-      - name: Cache node_modules
-        uses: actions/cache@v4
-        with:
-          path: |
-            nestsClient-browser-interop/node_modules
-            nestsClient-browser-interop/dist
-          key: ${{ runner.os }}-bun-${{ hashFiles('nestsClient-browser-interop/package.json', 'nestsClient-browser-interop/bun.lock') }}
-
-      # Cache Playwright's browser cache (~/.cache/ms-playwright/chromium-*).
-      # The cold install of Chromium is ~200 MB and 30–60 s; cached runs
-      # are essentially instant.
-      - name: Cache Playwright browsers
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/ms-playwright
-          key: ${{ runner.os }}-playwright-${{ hashFiles('nestsClient-browser-interop/package.json') }}
-
-      - name: Run browser cross-stack interop suite
-        run: |
-          ./gradlew :nestsClient:jvmTest \
-              --tests "com.vitorpamplona.nestsclient.interop.native.BrowserInteropTest" \
-              -DnestsHangInterop=true \
-              -DnestsBrowserInterop=true
-
-      - name: Upload browser interop test report
-        uses: actions/upload-artifact@v7
-        if: failure()
-        with:
-          name: Browser Interop Test Reports
-          path: |
-            nestsClient/build/reports/tests/jvmTest/
-            nestsClient-browser-interop/test-results/
-            nestsClient-browser-interop/playwright-report/
-
   test-and-build-android:
     needs: lint
     runs-on: ubuntu-latest