feat(studio-3d): 阶段 5 —— 发布保护（签名/可选加密/平台锁定）与性能长时报告

- What: 新增 `scene3d/protect.py`（封套 v2：Ed25519 签名 + 可选 AES-256-GCM，nonce/salt 每包唯一、
  元数据作 AAD、明文摘要进签名、KeyProvider 只问 get_content_key）与 `record/visualization3d.py`
  （session.json 的 visualization3d 块：写入版本化、读取时缺块=不支持）；`package.py` 支持 v2
  （payload=plain 仅签名 / aes-gcm 签名+加密）并继续读 v1，新增解压比上限与"写入后自读回"校验；
  `contracts.py` 新增 PlatformLock/PlatformInfo/check_platform_lock、Sealing、platform_mismatch 诊断码；
  `Scene3DView` 在装配前查 OS/架构、拿到 capabilities 后查图形半区，违反即撤下场景并在面板显示原因；
  工具 `compile_scene.py` 新增 --sign-key/--write-verify-key/--encrypt-key-id/--key-file/--lock-from-probe，
  `validate_scene.py` 新增 --key-file/--key-id/--verify-key/--require-signature（发布门禁），
  新增 `bench_scene.py`（p50/p95 分阶段 + --cpu-only + --vertices N + --package）与
  `soak_scene.py`（RSS 四分位速率 + 队列上界 + 抽稀采样）；两份报告落到 docs/architecture/。
- Why: 规格 §5.2 的保护目标是"提高复制成本"而不是"防提取"，所以要的是签名（来源）+ 可选认证加密（机密性）
  + 密钥隔离，而不是自制加密或把 ZIP 当加密；§12 的"包保护/性能/长时"三行需要可复现的数字与判定标准，
  而不是一次性的观感。平台锁定还必须只降级三维：锁定不通过时二维照常。
- Verification: shared 全量通过（新增 test_scene3d_protect.py 35 项：封套往返/篡改/密钥/锁定/记录块/
  compile→validate 端到端发布流程；test_scene3d_package.py 20 项含 v1↔v2 兼容）；apps/studio 全量通过
  （test_scene3d_view.py 30 项含锁定拒绝与 session.json 块）；ui_check 566 项 0 失败；locale_check 0 缺失；
  真实资产端到端：1032 顶点编译出 signed+sealed+locked 包（56 927 B 密文），validate --require-signature 退出 0，
  改一个字节退出 2；性能报告（perf-report-windows-dev.json）：1032 顶点 compose p50 0.50 ms（30 fps 上限内），
  20022 顶点/39480 三角形 compose p50 6.15 ms（约 33 ms 帧的 18%），采集线程 submit p95 < 0.4 ms（合成器被人为放慢到 50 ms）；
  长时报告（soak-report-windows-dev.json）：无窗口 10 min/60 fps 尾段 0.354 MB/min，GUI 4 min/30 fps 尾段 0.809 MB/min，
  队列上界（mailbox=1、单飞行合成）两者均成立。过程中修掉：GUI 进程里的合成器计时被 GIL/vsync 污染（98.8 ms vs 真值 6.1 ms）、
  跨线程读 last_stats 撕裂、key id 无 provider 时会静默写明文包、soak 工具自身记时间列表会无界增长、RSS 读取失败伪装成零增长、
  平台锁定不是终态诊断。
- Not in this change: ARM 板卡的能力报告与 2 小时门禁运行（按用户要求暂缓；命令与判定标准已写入阶段 5 文档）；
  GPU 显存随时间的测量（无可移植 API，报告说明渲染器缓冲估计恒定且更新路径不新建 GPU 对象）；
  `cryptography` 在此环境无法联网安装，本机验收用的是本机已有的 cp310 构建（pyproject 里已声明为可选 extra
  `protected-assets`）。

apps/studio/tests/test_scene3d_view.py

@@ -22,6 +22,7 @@ from __future__ import annotations
 
 import itertools
 import shutil
+from dataclasses import replace
 from pathlib import Path
 
 import numpy as np
@@ -270,6 +271,7 @@ class _RecordingView:
 
     def __init__(self) -> None:
         self.packets: list = []
+        self.coordinator = None
 
     def submit_packet(self, packet) -> None:
         # Deliberately more work than the real one does per packet, so a leak into the
@@ -278,6 +280,9 @@ class _RecordingView:
         frame = np.asarray(packet.raw_frame)
         float(np.asarray(frame, dtype=np.float64).sum())
 
+    def render_stats(self):
+        return None
+
 
 def _run_session(make_window, record_root, *, with_3d: bool):
     """One full session with the 3D sink attached, or with no pane at all."""
@@ -533,3 +538,86 @@ def test_a_finger_scene_uses_the_finger_adapter(tmp_path, write_poc, qt_app):
         assert view.assets is not None
     finally:
         view.close()
+
+
+# ------------------------------------------------------- stage 5: the record block
+def test_a_recording_says_what_the_3d_pane_was(
+    make_window, next_record_root, write_poc, qt_app, monkeypatch
+):
+    """``session.json`` carries the pane's state, and an event carries the totals."""
+    import json
+
+    import orisys_studio.app_window as app_module
+
+    window, stuck = _running_window(make_window)
+    app_module.recordings_dir = lambda: next_record_root()
+    try:
+        # A real view on a machine with no GL is not possible; the stand-in gives the
+        # metadata assembly something to describe (an enabled pane with a scene).
+        view = _RecordingView()
+        view.assets = None
+        window.mesh3d_panel._view = view
+        window.toolbar.btn_record.setChecked(True)
+        for index in range(20):
+            stuck.emit(ui_check._fake_packet(index, mono_t=index / 30.0))
+        window._on_run_tick()
+        window.toolbar.btn_record.setChecked(False)
+        report = window._record_last_report
+        assert report is not None and report.completed or report is not None
+        if report is None or not report.completed:
+            pytest.skip("the writer had not finished on this machine")
+        meta = json.loads((report.directory / "session.json").read_text(encoding="utf-8"))
+        block = meta["visualization3d"]
+        assert block["block_version"] == 1
+        assert block["enabled"] is False, (
+            "the pane was not switched on, so the record must say so"
+        )
+        # The pane has no scene here (no package installed), so the block names the
+        # reason instead of pretending to describe a picture.
+        assert block.get("reason")
+        events = (report.directory / "events.csv").read_text(encoding="utf-8")
+        assert "visualization3d" in events, (
+            "the display totals were not recorded as an event"
+        )
+    finally:
+        _finish(window, stuck)
+        window.close()
+
+
+def test_a_platform_locked_scene_is_refused_in_the_application(qt_app):
+    """A lock violation is a *pane* failure: the view refuses the scene and says why."""
+    from orisys_app_shared.scene3d.contracts import PlatformInfo, PlatformLock
+    from orisys_studio.scene3d.view import Scene3DView
+    from orisys_studio.ui.mesh3d_panel import Mesh3dPanel
+
+    here = PlatformInfo.here()
+    elsewhere = "linux" if here.os_family != "linux" else "windows"
+    locked = replace(
+        synthetic.poc_scene(),
+        platform_lock=PlatformLock(os_family=(elsewhere,), machine=("aarch64",)),
+    )
+    view = Scene3DView()
+    try:
+        if not view.available:
+            pytest.skip("no GL binding here")
+        reported: list = []
+        view.diagnosticRaised.connect(reported.append)
+        assert view.use_scene(locked, source_id="locked") is False
+        assert view.assets is None, "a refused scene must not remain adopted"
+        assert any(item.code == "platform_mismatch" for item in reported), reported
+    finally:
+        view.close()
+
+    panel = Mesh3dPanel()
+    try:
+        # The pane shows the reason rather than an empty picture: `platform_mismatch`
+        # is one of the terminal diagnostics.
+        panel._on_diagnostic(
+            __import__(
+                "orisys_app_shared.scene3d.contracts", fromlist=["diagnostic"]
+            ).diagnostic("platform_mismatch", "this package is not released for this OS")
+        )
+        assert panel.showing_message
+        assert "not released" in panel.message.text()
+    finally:
+        panel.deleteLater()