Harden concurrency and resource lifecycle (#101)

.gitea/workflows/concurrency-audit.yml

@@ -0,0 +1,71 @@
+name: Concurrency and resource soak audit
+
+on:
+  push:
+    paths:
+      - ".gitea/workflows/concurrency-audit.yml"
+      - "ci/concurrency-thresholds.json"
+      - "tools/concurrency-audit/**"
+      - "docs/concurrency-hardening.md"
+      - "crates/libremetaverse/src/client_core.rs"
+      - "crates/libremetaverse/src/download_manager.rs"
+      - "crates/libremetaverse/src/appearance_manager.rs"
+      - "crates/libremetaverse/src/asset_manager.rs"
+      - "crates/libremetaverse/src/inventory_manager.rs"
+      - "crates/libremetaverse-voice-webrtc/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+  pull_request:
+    paths:
+      - ".gitea/workflows/concurrency-audit.yml"
+      - "ci/concurrency-thresholds.json"
+      - "tools/concurrency-audit/**"
+      - "docs/concurrency-hardening.md"
+      - "crates/libremetaverse/src/client_core.rs"
+      - "crates/libremetaverse/src/download_manager.rs"
+      - "crates/libremetaverse/src/appearance_manager.rs"
+      - "crates/libremetaverse/src/asset_manager.rs"
+      - "crates/libremetaverse/src/inventory_manager.rs"
+      - "crates/libremetaverse-voice-webrtc/**"
+      - "Cargo.toml"
+      - "Cargo.lock"
+  workflow_dispatch:
+
+env:
+  CARGO_BUILD_JOBS: 1
+  CARGO_INCREMENTAL: 0
+  CARGO_PROFILE_DEV_DEBUG: 0
+  CARGO_PROFILE_TEST_DEBUG: 0
+
+jobs:
+  soak:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - name: Install native voice prerequisite
+        run: |
+          sudo apt-get update
+          sudo apt-get install --yes libopus-dev pkg-config
+      - name: Check formatting and focused race regressions
+        run: |
+          cargo fmt --all -- --check
+          cargo test --locked -p libremetaverse --lib shutdown_does_not_hold_service_registry_lock_across_callbacks -j 1
+          cargo test --locked -p libremetaverse --lib event_registry_isolates_panics_and_releases_subscriptions -j 1
+          cargo test --locked -p libremetaverse --lib dispatch_isolates_panics_and_does_not_retain_dropped_handlers -j 1
+          cargo test --locked -p libremetaverse --test caps_http download_queue_applies_backpressure_and_cancellation_drains_every_job -j 1
+          cargo test --locked -p libremetaverse-voice-webrtc concurrent_provisioning_admits_one_session_without_leaking_the_loser -j 1
+      - name: Run bounded native soak
+        run: |
+          mkdir -p artifacts
+          cargo run --locked -p metacrate-concurrency-audit -j 1 -- \
+            --cycles 16 --evidence artifacts/concurrency-audit.json
+      - name: Upload sanitized resource evidence
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: concurrency-audit-evidence
+          path: artifacts/concurrency-audit.json
+          if-no-files-found: error