fix(tests): Remove --forked for accurate coverage reporting

Remove pytest-forked in favor of pytest-xdist only for parallel test
execution. This should improve coverage accuracy by ensuring coverage
data is properly collected from all worker processes.

When using both --forked and -n auto together, coverage data from the
inner forked processes created by pytest-forked may not be collected
properly by pytest-cov, as the coverage plugin only has special handling
for xdist workers.

This follows the same approach as OpenHands/software-agent-sdk#1658 which
fixed near-0% coverage reporting issues.

Changes:
- Remove --forked flag from pytest commands in py-tests.yml
- Remove pytest-forked from test dependencies in pyproject.toml
- Remove pytest-forked from enterprise/pyproject.toml

.github/workflows/py-tests.yml

@@ -55,7 +55,7 @@ jobs:
       - name: Build Environment
         run: make build
       - name: Run Unit Tests
-        run: PYTHONPATH=".:$PYTHONPATH" poetry run pytest --forked -n auto -s ./tests/unit --cov=openhands --cov-branch
+        run: PYTHONPATH=".:$PYTHONPATH" poetry run pytest -n auto -s ./tests/unit --cov=openhands --cov-branch
         env:
           COVERAGE_FILE: ".coverage.${{ matrix.python_version }}"
       - name: Run Runtime Tests with CLIRuntime
@@ -91,7 +91,7 @@ jobs:
         run: poetry install --with dev,test
       - name: Run Unit Tests
         # Use base working directory for coverage paths to line up.
-        run: PYTHONPATH=".:$PYTHONPATH" poetry run --project=enterprise pytest --forked -n auto -s -p no:ddtrace -p no:ddtrace.pytest_bdd -p no:ddtrace.pytest_benchmark ./enterprise/tests/unit --cov=enterprise --cov-branch
+        run: PYTHONPATH=".:$PYTHONPATH" poetry run --project=enterprise pytest -n auto -s -p no:ddtrace -p no:ddtrace.pytest_bdd -p no:ddtrace.pytest_benchmark ./enterprise/tests/unit --cov=enterprise --cov-branch
         env:
           COVERAGE_FILE: ".coverage.enterprise.${{ matrix.python_version }}"
       - name: Store coverage file

enterprise/pyproject.toml

@@ -61,7 +61,6 @@ types-requests = "^2.32.4.20250611"
 pytest = "*"
 pytest-cov = "*"
 pytest-asyncio = "*"
-pytest-forked = "*"
 pytest-xdist = "*"
 flake8 = "*"
 openai = "*"

pyproject.toml

@@ -130,7 +130,6 @@ test = [
   "pytest",
   "pytest-asyncio",
   "pytest-cov",
-  "pytest-forked",
   "pytest-playwright>=0.7",
   "pytest-timeout>=2.4",
   "pytest-xdist",
@@ -281,7 +280,6 @@ optional = true
 pytest = "*"
 pytest-cov = "*"
 pytest-asyncio = "*"
-pytest-forked = "*"
 pytest-xdist = "*"
 pytest-playwright = "^0.7.0"
 pytest-timeout = "^2.4.0"