v0.2.0: splats, copy/paste, faster homes, seat facing, and a full bug sweep

Frame Studio
- Gaussian splats (PLY, SPZ v2-v4), PLY vertex colours, panorama skies
- Copy, cut, paste and duplicate for objects, splats and world items
- Walkable-area rebake moved off the UI thread; viewport one frame sooner;
  refresh-locked pacing (FS_PACE=timer for the old one)
- Fixed: bundle thumbnail use-after-free crash, auto-save deleting
  environments, saves into scratch copies, edits lost on non-ASCII paths,
  unopenable manifests with inf/nan, bundle save data loss, opening a home
  marking it changed, gizmo NaN, long paths, many malformed-file crashes
- Updater verifies sha256, journals the swap and never leaves the exe missing

Frame Home
- Seats turn you to face their way
- Draw batching (Hand Tutorials up to ~20% less GPU time), cut-out EQUAL pass,
  late head-pose read before submit
- Proper queue-family hand-over to the compositor layer; layer descriptor
  generations and seqlocked slots; structural SPIR-V check
- Fixed: hangs/crashes on damaged .fenv files and shaders, render-pass
  validation error, sync hazard in the foveation smoothing pass, unverified
  update downloads, half-done installs

Tests: tests_loco/env_share/spv_check wired into CMake (FRAME_TESTS) and CI.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VsaXGU27gsrXjDoFtyFJP9

third_party/spirv-tools/source/util/timer.cpp

@@ -0,0 +1,102 @@
+// Copyright (c) 2018 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#if defined(SPIRV_TIMER_ENABLED)
+
+#include "source/util/timer.h"
+
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <iomanip>
+#include <iostream>
+#include <string>
+
+namespace spvtools {
+namespace utils {
+
+void PrintTimerDescription(std::ostream* out, bool measure_mem_usage) {
+  if (out) {
+    *out << std::setw(30) << "PASS name" << std::setw(12) << "CPU time"
+         << std::setw(12) << "WALL time" << std::setw(12) << "USR time"
+         << std::setw(12) << "SYS time";
+    if (measure_mem_usage) {
+      *out << std::setw(12) << "RSS delta" << std::setw(16) << "PGFault delta";
+    }
+    *out << std::endl;
+  }
+}
+
+// Do not change the order of invoking system calls. We want to make CPU/Wall
+// time correct as much as possible. Calling functions to get CPU/Wall time must
+// closely surround the target code of measuring.
+void Timer::Start() {
+  if (report_stream_) {
+    if (getrusage(RUSAGE_SELF, &usage_before_) == -1)
+      usage_status_ |= kGetrusageFailed;
+    if (clock_gettime(CLOCK_MONOTONIC, &wall_before_) == -1)
+      usage_status_ |= kClockGettimeWalltimeFailed;
+    if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &cpu_before_) == -1)
+      usage_status_ |= kClockGettimeCPUtimeFailed;
+  }
+}
+
+// The order of invoking system calls is important with the same reason as
+// Timer::Start().
+void Timer::Stop() {
+  if (report_stream_ && usage_status_ == kSucceeded) {
+    if (clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &cpu_after_) == -1)
+      usage_status_ |= kClockGettimeCPUtimeFailed;
+    if (clock_gettime(CLOCK_MONOTONIC, &wall_after_) == -1)
+      usage_status_ |= kClockGettimeWalltimeFailed;
+    if (getrusage(RUSAGE_SELF, &usage_after_) == -1)
+      usage_status_ = kGetrusageFailed;
+  }
+}
+
+void Timer::Report(const char* tag) {
+  if (!report_stream_) return;
+
+  report_stream_->precision(2);
+  *report_stream_ << std::fixed << std::setw(30) << tag;
+
+  if (usage_status_ & kClockGettimeCPUtimeFailed)
+    *report_stream_ << std::setw(12) << "Failed";
+  else
+    *report_stream_ << std::setw(12) << CPUTime();
+
+  if (usage_status_ & kClockGettimeWalltimeFailed)
+    *report_stream_ << std::setw(12) << "Failed";
+  else
+    *report_stream_ << std::setw(12) << WallTime();
+
+  if (usage_status_ & kGetrusageFailed) {
+    *report_stream_ << std::setw(12) << "Failed" << std::setw(12) << "Failed";
+    if (measure_mem_usage_) {
+      *report_stream_ << std::setw(12) << "Failed" << std::setw(12) << "Failed";
+    }
+  } else {
+    *report_stream_ << std::setw(12) << UserTime() << std::setw(12)
+                    << SystemTime();
+    if (measure_mem_usage_) {
+      *report_stream_ << std::fixed << std::setw(12) << RSS() << std::setw(16)
+                      << PageFault();
+    }
+  }
+  *report_stream_ << std::endl;
+}
+
+}  // namespace utils
+}  // namespace spvtools
+
+#endif  // defined(SPIRV_TIMER_ENABLED)