test(windows): make path assertions and chmod tests OS-aware

[danielmeppiel]

Problem

Windows CI on main is red (run 26061585552). Linux and macOS pass — only the Windows job fails, with six unit-test failures that all encode POSIX-only assumptions:

FAILED tests/unit/runtime/test_runtime_utils.py::TestFindRuntimeBinary::test_skips_non_executable_apm_binary
FAILED tests/unit/runtime/test_runtime_utils.py::TestFindRuntimeBinary::test_apm_binary_without_execute_permission_falls_back
FAILED tests/unit/integration/test_hook_integrator.py::TestClaudeIntegration::test_integrate_hookify_claude
FAILED tests/unit/integration/test_hook_integrator.py::TestClaudeIntegration::test_integrate_hooks_with_scripts_in_hooks_subdir_claude
FAILED tests/unit/integration/test_hook_integrator.py::TestCursorIntegration::test_integrate_hookify_cursor
FAILED tests/unit/integration/test_hook_integrator.py::TestIssue1007Fixes::test_rewrite_command_deploy_root_produces_absolute_path

Both groups are test-only defects; production code behaves correctly on Windows.

Root cause

Runtime tests (2) — both call chmod(0o644) / chmod(0o600) on the APM-managed binary expecting find_runtime_binary() to fall back to shutil.which() because the file is "not executable". Windows ignores POSIX execute bits: os.access(path, os.X_OK) returns True for any readable file, so the fallback branch is unreachable and the test asserts the wrong path.

Hook integrator tests (4) — all assert forward-slash substrings such as ".claude/hooks/hookify/hooks/pretooluse.py" in cmd. When deploy_root is set, _rewrite_command_for_target() emits absolute paths via Path.resolve(), which uses native separators (backslash on Windows). This is the correct production behaviour — Claude Code / Cursor on Windows expect Windows paths — so the fix is on the assertion side.

Fix

• Skip the two chmod-based runtime tests on win32 with a reason documenting the platform limitation. Other tests in the same class already use @pytest.mark.skipif(sys.platform != "win32", ...) for the inverse case, so the pattern is established.
• Normalise backslashes to forward slashes (cmd.replace("\\", "/")) before the substring / endswith check in the four hook-integrator tests. The production rewriter is untouched.

No src/ changes — six test-only edits, 17 lines added / 7 removed.

Validation

Locally:

$ uv run --extra dev pytest tests/unit/runtime/test_runtime_utils.py tests/unit/integration/test_hook_integrator.py -q
154 passed, 1 skipped in 2.17s
$ uv run --extra dev ruff check src/ tests/ && uv run --extra dev ruff format --check src/ tests/
All checks passed!
786 files already formatted

Both CI-mirror lint commands are silent per .apm/instructions/linting.instructions.md. Windows CI on this branch will confirm the six previously-failing tests now pass / skip cleanly.

[Copilot]

Pull request overview

This PR fixes Windows-only unit test failures by making test assertions OS-aware, without changing production code. It aligns runtime permission tests with Windows semantics and makes hook-integrator path assertions resilient to native path separators.

Changes:

• Skip two chmod/execute-bit-based runtime tests on win32, documenting why the branch is unreachable on Windows.
• Normalize command-path separators in four hook-integrator tests by replacing backslashes before substring/endswith assertions.

Show a summary per file

File	Description
tests/unit/runtime/test_runtime_utils.py	Skips POSIX execute-bit dependent tests on Windows to match os.access(X_OK) behavior.
tests/unit/integration/test_hook_integrator.py	Normalizes path separators in assertions so rewritten hook commands pass on Windows and POSIX.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0