feat: PowerShell 7 preflight and launcher - preflight.ps1, wikitool.ps1, doctor policy and Mark of the Web checks, pwsh CI job (#151, B)

Files changed:
- .gitea/workflows/ci.yml
- CHANGES.md
- INSTALL.md
- README.md
- VERSION
- docs/why-gates-are-code.md
- instructions/bootstrap.md
- instructions/bug-report.md
- instructions/preflight.md
- instructions/setup-instance.md
- instructions/upgrade-instance.md
- tools/CONTRACT.md
- tools/README.md
- tools/bugreport.py
- tools/chemenu/cli.py
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/prerequisites.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/test_bugreport.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_preflight.py
- tools/chemenu/tests/test_preflight_pwsh.py
- tools/chemenu/toolpaths.py
- tools/preflight.ps1
- tools/wikitool
- tools/wikitool.ps1

tools/chemenu/tests/test_bugreport.py

@@ -61,7 +61,7 @@ def checkout(tmp_path: Path, monkeypatch) -> Path:
         json.dumps({"schema": 1, "api_token": TOKEN, "enabled": True})
     )
     (root / ".wikitool-tools.json").write_text(
-        json.dumps({"schema": 1, "tools": {"python": {"path": "/definitely/not/here/python"}}})
+        json.dumps({"schema": 1, "complete": True, "tools": {"python": "/definitely/not/here/python"}})
     )
     launcher = root / "tools" / "wikitool"
     launcher.write_text(LAUNCHER.format(python=sys.executable, title=TITLE))
@@ -271,8 +271,9 @@ def test_the_tools_config_path_check_reports_what_is_missing(checkout, tmp_path)
     bundle = collect(checkout, tmp_path, "--no-trace")
     config = json.loads((bundle / "environment.json").read_text())["tools_config"]
     assert config["status"] == "present"
+    assert config["content"]["complete"] is True
     assert config["path_checks"] == [
-        {"at": "tools.python.path", "path": "/definitely/not/here/python", "exists": False}
+        {"at": "tools.python", "path": "/definitely/not/here/python", "exists": False}
     ]