[Fix] (DirectVulkan, GLImpl, MG_State, ShaderTranspiler): second audit round over the remaining memo sites

Six more verified defects from the residual memo/cache mechanisms:

- Program resource cache (DirectVulkan reflection): glShaderStorageBlockBinding
  deliberately does not bump the backend state version, and the SSO pipeline
  composite is unnamed so the by-name in-place patch can never reach its slot -
  the composite kept serving pre-rebind SSBO bindings. The cache now keys on the
  program's block-binding version; a binding-only change re-applies the overrides
  by name instead of re-running spirv-reflect. SetShaderStorageBlockBinding also
  gains the equality bail-out its uniform-block sibling has, so the composite
  mirror's replay stops churning the version every draw.
- LinkProgram's allowVSOnlyPrograms function-static latch never set its own
  initialized flag (dead memo, re-read every call) - and completing it would have
  frozen a per-backend capability across re-initialization. Replaced with a fresh
  per-link read from the null-checked active backend.
- Query object registry: drained at full library teardown (DestroyAllQueryObjects,
  mirroring DestroyAllSyncObjects) - undeleted queries and their backend wrappers
  leaked across Destroy/Initialize cycles, stale ids stayed IsQuery == GL_TRUE in
  the re-initialized library, and a later delete could hand the old backend's
  wrapper to a different backend's DeleteBackendQuery.
- Converted vertex streams and the host-side EBO max-index scan now SyncGpuWrites
  before reading the coherent mapping: XFB/SSBO/image writes are merely recorded
  at that point, so the conversion read pre-write bytes (the restart-index
  rewrite already synced; these two host reads did not).
- Zero-stride converted bindings: both converters rejected stride 0, making the
  factory's documented single-element conversion unreachable and silently
  dropping every draw using such a binding; the stride is substituted with the
  element size for the one-element case.
- DemoteFloat64Pass block relayout: measurement queued into the module eagerly,
  so a mid-struct failure left a half-relaid-out block (compacted offsets before
  the failing member, 64-bit offsets after) while claiming the block was left
  alone. Decoration writes are now collected and committed only when the whole
  block measures successfully.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MsqQQF7ugn7MqZXcmnmz1z

MobileGL/MG_Backend/DirectVulkan/DirectVulkan.cpp

@@ -69,6 +69,12 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             // slot's ownership unambiguous.
             Uint64 programLifetimeId = 0;
             Uint32 backendStateVersion = 0;
+            // glShaderStorageBlockBinding deliberately does NOT bump the backend state
+            // version, and the pipeline composite is unnamed so the in-place patch in
+            // DirectVulkan::ShaderStorageBlockBinding can never reach its slot - the
+            // mirror replay bumps only the program's block-binding version. Without this
+            // key the composite's slot kept serving the pre-rebind block.binding.
+            Uint32 blockBindingVersion = 0;
             Vector<StorageBlockResource> storageBlocks;
             Vector<BufferVariableResource> bufferVariables;
             GLint computeWorkGroupSize[3] = {1, 1, 1};
@@ -156,18 +162,33 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             auto& cache = g_programResourceCaches[program.GetExternalIndex()];
             const Uint64 programLifetimeId = program.GetLifetimeId();
             const Uint32 backendStateVersion = program.GetBackendStateVersion();
+            const Uint32 blockBindingVersion = program.GetBlockBindingVersion();
             // The lifetime id must match too: a new program that reuses a deleted
             // program's name and happens to land on the same backendStateVersion (both
             // count from zero) would otherwise be served the dead program's reflection.
             if (cache.programLifetimeId == programLifetimeId &&
                 cache.backendStateVersion == backendStateVersion &&
                 (!cache.storageBlocks.empty() || !cache.bufferVariables.empty())) {
+                if (cache.blockBindingVersion != blockBindingVersion) {
+                    // Only the block bindings moved (glShaderStorageBlockBinding, or the
+                    // pipeline composite's mirror replay - neither touches the backend
+                    // state version): the reflection itself is unchanged, so re-apply the
+                    // overrides by name instead of re-running spirv-reflect. Overrides
+                    // only ever accumulate, so a block without one still holds its
+                    // declared binding.
+                    for (auto& block : cache.storageBlocks) {
+                        const Int rebound = program.GetShaderStorageBlockBindingOverride(block.name);
+                        if (rebound >= 0) block.binding = static_cast<Uint32>(rebound);
+                    }
+                    cache.blockBindingVersion = blockBindingVersion;
+                }
                 return cache;
             }
 
             cache = {};
             cache.programLifetimeId = programLifetimeId;
             cache.backendStateVersion = backendStateVersion;
+            cache.blockBindingVersion = blockBindingVersion;
 
             Vector<SpvReflectShaderModule> modules;
             Vector<Bool> validModules;