Add native SwiftUI player and macOS CI

tools/validate_project.py

@@ -0,0 +1,34 @@
+"""Cross-platform structural checks only; this does not compile or test Swift."""
+import hashlib
+import json
+import pathlib
+import plistlib
+import re
+import subprocess
+import sys
+import xml.etree.ElementTree as ET
+
+root = pathlib.Path(__file__).resolve().parents[1]
+generated = [root / "MusicBridge.xcodeproj/project.pbxproj",
+             root / "MusicBridge.xcodeproj/xcshareddata/xcschemes/MusicBridge.xcscheme",
+             root / "MusicBridge/Info.plist"]
+before = [p.read_bytes() for p in generated]
+subprocess.run([sys.executable, str(root / "tools/generate_project.py")], check=True)
+assert before == [p.read_bytes() for p in generated], "Generated project is stale; review and commit regeneration."
+project = generated[0].read_text(encoding="utf-8")
+for folder in ("MusicBridge", "MusicBridgeTests"):
+    for source in (root / folder).glob("*.swift"):
+        key = hashlib.sha256(source.relative_to(root).as_posix().encode()).hexdigest()[:24].upper()
+        assert key in project, f"Missing source: {source.name}"
+defined = set(re.findall(r'"([A-F0-9]{24})" = \{', project))
+referenced = set(re.findall(r'"([A-F0-9]{24})"', project))
+assert defined == referenced, "Project has dangling object references."
+info = plistlib.loads(generated[2].read_bytes())
+assert info["NSLocalNetworkUsageDescription"]
+assert info["NSAppTransportSecurity"] == {"NSAllowsLocalNetworking": True}
+ET.parse(generated[1])
+fixture = json.loads((root / "MusicBridgeTests/state-v1.json").read_text(encoding="utf-8"))
+assert fixture["protocolVersion"] == 1 and fixture["positionSeconds"] == 42.5
+assert set(fixture["capabilities"]) == {"play", "pause", "toggle", "next", "previous", "seek"}
+print("PASS: deterministic project, source membership, object references, plist, scheme XML, protocol fixture.")
+print("Swift compilation and XCTest must run on macOS/Xcode.")