Implement playable Mac client and rendering validation

test/playable/clean.log

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+PLAYABLE FIXTURE: child completed without renderer errors

test/playable/report.blocked.json

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+{
+  "schema_version": 1,
+  "run_id": "fixture-blocked",
+  "suite": "playable",
+  "status": "BLOCKED",
+  "build": {
+    "engine_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "extension_sha256": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+    "pck_sha256": "cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
+    "arch": "arm64"
+  },
+  "environment": {"os": "macOS", "renderer": "Metal", "resolution": [1280, 720]},
+  "cases": [{"id": "FIXTURE-01", "status": "BLOCKED", "duration_ms": 0, "reason": "fixture_not_ready", "evidence": []}],
+  "events": "events.jsonl",
+  "failures": [],
+  "blocked": ["fixture_not_ready"],
+  "coverage": {"required": 1, "passed": 0},
+  "exit_gate": {"checked": false, "process_code": null, "errors": []}
+}

test/playable/report.valid.json

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+{
+  "schema_version": 1,
+  "run_id": "fixture-valid",
+  "suite": "playable",
+  "status": "PASS",
+  "build": {
+    "engine_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "extension_sha256": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
+    "pck_sha256": "cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc",
+    "arch": "arm64"
+  },
+  "environment": {"os": "macOS", "renderer": "Metal", "resolution": [1280, 720]},
+  "cases": [{"id": "FIXTURE-01", "status": "PASS", "duration_ms": 1, "reason": "ok", "evidence": []}],
+  "events": "events.jsonl",
+  "failures": [],
+  "blocked": [],
+  "coverage": {"required": 1, "passed": 1},
+  "exit_gate": {"checked": false, "process_code": null, "errors": []}
+}

test/playable/rid-warning.log

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+WARNING: 3 shaders of type CanvasItem were never freed.

test/playable/scenario.example.json

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+{
+  "schema_version": 1,
+  "scenario_id": "first-mac-playable-forest",
+  "protocol": "classic",
+  "server": {
+    "server_index": 0,
+    "channel_index": 0
+  },
+  "character_slot": 0,
+  "map_key": "",
+  "waypoints_cm": [],
+  "allowed_mob_vnums": [],
+  "allowed_drop_vnums": [],
+  "skill_cases": [],
+  "resolution": [1280, 720],
+  "loops": 3,
+  "timeout_seconds": 120,
+  "notes": "Copy to a local ignored file and fill from the confirmed server fixture. Never add credentials here."
+}