fix(tutorials): install dev extras when running tutorial pytest

After #367 dropped pytest from agentex-sdk's runtime deps, `uv run
pytest` in tutorials no longer finds pytest — it lives in each
tutorial's [project.optional-dependencies] dev. Pass --extra dev so uv
installs it before spawning pytest. Fixes the "Failed to spawn: pytest"
regression seen across every tutorial test job since 2026-05-29.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: declan-scale

examples/tutorials/run_agent_test.sh

@@ -260,15 +260,15 @@ run_test() {
 
 
     # Run the tests with retry mechanism
-    local -a pytest_cmd=("uv" "run" "pytest")
+    local -a pytest_cmd=("uv" "run" "--extra" "dev" "pytest")
     if [ "$BUILD_CLI" = true ]; then
         local wheel_file
         wheel_file=$(ls /home/runner/work/*/*/dist/agentex_sdk-*.whl 2>/dev/null | head -n1)
         if [[ -z "$wheel_file" ]]; then
             wheel_file=$(ls "${SCRIPT_DIR}/../../dist/agentex_sdk-*.whl" 2>/dev/null | head -n1)
         fi
         if [[ -n "$wheel_file" ]]; then
-            pytest_cmd=("uv" "run" "--with" "$wheel_file" "pytest")
+            pytest_cmd=("uv" "run" "--extra" "dev" "--with" "$wheel_file" "pytest")
         fi
     fi