fix(cohere): trace v2 clients and async chat streams

.github/workflows/cohere-python-tests.yml

@@ -0,0 +1,71 @@
+name: Cohere Python contracts
+
+on:
+  pull_request:
+    branches: [main, dev]
+    paths:
+      - 'python/frameworks/cohere/**'
+      - '.github/workflows/cohere-python-tests.yml'
+  push:
+    branches: [dev]
+    paths:
+      - 'python/frameworks/cohere/**'
+      - '.github/workflows/cohere-python-tests.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  contract:
+    name: Cohere (${{ matrix.label }})
+    runs-on: ubuntu-24.04
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - label: SDK and core floors
+            python: '3.10'
+            cohere: 'cohere==5.0.0'
+            core: 'fi-instrumentation-otel==1.2.2'
+            httpx: 'httpx==0.27.2'
+          - label: early v2
+            python: '3.12'
+            cohere: 'cohere==5.13.12'
+            core: 'fi-instrumentation-otel==1.2.2'
+            httpx: 'httpx'
+          - label: latest SDK and core
+            python: '3.13'
+            cohere: 'cohere'
+            core: 'fi-instrumentation-otel'
+            httpx: 'httpx'
+    env:
+      FI_BASE_URL: http://127.0.0.1:9
+      FI_GRPC_URL: http://127.0.0.1:9
+      COHERE_REQUIREMENT: ${{ matrix.cohere }}
+      CORE_REQUIREMENT: ${{ matrix.core }}
+      HTTPX_REQUIREMENT: ${{ matrix.httpx }}
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install distribution and compatibility dependencies
+        shell: bash
+        run: |
+          python -m venv .cohere-test-venv
+          .cohere-test-venv/bin/pip install ./python/frameworks/cohere \
+            "$COHERE_REQUIREMENT" "$CORE_REQUIREMENT" "$HTTPX_REQUIREMENT" \
+            pytest pytest-asyncio opentelemetry-exporter-otlp-proto-http
+          .cohere-test-venv/bin/pip check
+      - name: Test with only loopback networking
+        shell: bash
+        run: |
+          sudo --preserve-env=FI_BASE_URL,FI_GRPC_URL unshare --net bash -c '
+            set -e
+            ip link set lo up
+            "$1" -I -m pytest python/frameworks/cohere/tests \
+              --import-mode=importlib -q -p no:cacheprovider
+          ' _ "$PWD/.cohere-test-venv/bin/python"