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/val/validate_debug.cpp

@@ -0,0 +1,72 @@
+// 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.
+
+#include "source/spirv_target_env.h"
+#include "source/val/instruction.h"
+#include "source/val/validate.h"
+#include "source/val/validation_state.h"
+
+namespace spvtools {
+namespace val {
+namespace {
+
+spv_result_t ValidateMemberName(ValidationState_t& _, const Instruction* inst) {
+  const auto type_id = inst->GetOperandAs<uint32_t>(0);
+  const auto type = _.FindDef(type_id);
+  if (!type || spv::Op::OpTypeStruct != type->opcode()) {
+    return _.diag(SPV_ERROR_INVALID_ID, inst)
+           << "OpMemberName Type <id> " << _.getIdName(type_id)
+           << " is not a struct type.";
+  }
+  const auto member_id = inst->GetOperandAs<uint32_t>(1);
+  const auto member_count = (uint32_t)(type->words().size() - 2);
+  if (member_count <= member_id) {
+    return _.diag(SPV_ERROR_INVALID_ID, inst)
+           << "OpMemberName Member <id> " << _.getIdName(member_id)
+           << " index is larger than Type <id> " << _.getIdName(type->id())
+           << "s member count.";
+  }
+  return SPV_SUCCESS;
+}
+
+spv_result_t ValidateLine(ValidationState_t& _, const Instruction* inst) {
+  const auto file_id = inst->GetOperandAs<uint32_t>(0);
+  const auto file = _.FindDef(file_id);
+  if (!file || spv::Op::OpString != file->opcode()) {
+    return _.diag(SPV_ERROR_INVALID_ID, inst)
+           << "OpLine Target <id> " << _.getIdName(file_id)
+           << " is not an OpString.";
+  }
+  return SPV_SUCCESS;
+}
+
+}  // namespace
+
+spv_result_t DebugPass(ValidationState_t& _, const Instruction* inst) {
+  switch (inst->opcode()) {
+    case spv::Op::OpMemberName:
+      if (auto error = ValidateMemberName(_, inst)) return error;
+      break;
+    case spv::Op::OpLine:
+      if (auto error = ValidateLine(_, inst)) return error;
+      break;
+    default:
+      break;
+  }
+
+  return SPV_SUCCESS;
+}
+
+}  // namespace val
+}  // namespace spvtools