…es layout

The instance UBO is injected at compile time by ShaderFactory, so the
original shader uniform declarations don't need modification.

Bring back normalMat extraction, transform_declare reordering,
trailing whitespace fixes, and VertexPBR indent fix. Only the
renderer_Layer relocation stays reverted.

… 3×vec4

- Fix SubRenderElement.set() not resetting instanceDataPacker, causing
  stale packer references from previous frames to break all batching
- Use whitelist + _group fallback for identifying renderer uniforms in
  _scanInstanceUniforms (fixes _group===undefined for ModelMat)
- Store ModelMat as 3×vec4 (affine rows) instead of mat4 in UBO,
  saving 16 bytes per instance (structSize 80→64, +25% instances/batch)
- Add camera_VPMat to transform_declare.glsl for derived MVP define
- Extract struct definition outside uniform block (GLSL ES 3.00 compat)
- Fix _insertUBOBlock to only scan initial #define preamble
- Pass instanceID to fragment shader via flat varying

…lity

Wrap derived NormalMat define with mat4() so instancing and non-instancing
paths both produce mat4, avoiding shader compilation errors.
Add custom instance data example to verify per-renderer uniform batching.

Rename elementA/elementB to preSubElement/subElement across all
renderer subclasses and BatchUtils. Change _batch signature so
preSubElement is nullable (null = batch head, no previous element
to merge with), and subElement is always required.

- Move RENDERER_GPU_INSTANCE macro from ShaderMacro to InstanceDataPacker
- Rename getOrCreate() to get() in InstanceDataPackerPool
- Clear compileMacros in InstanceDataPacker.reset()

Move macro merging, layout computation, and UBO packing from batch
phase to render phase. _batch now only collects renderers into a
pre-allocated list. RenderQueue.render handles macro union, layout
lookup, and splits by maxInstanceCount for sub-batch rendering.

- SubRenderElement: instanceDataPacker → instancedRenderers (pooled array)
- MeshRenderer._canBatch: remove maxInstanceCount check
- MeshRenderer._batch: only push renderers, zero allocation
- InstanceDataPacker: remove compileMacros/addRenderer/instanceCount,
  add packAndUpload(renderers, start, count)
- InstanceDataPackerPool: remove uploadBuffer, simplify reset
- BatcherManager: remove instancing uploadBuffer call

Packer is now stateless (setLayout + packAndUpload + draw), so only
one instance is needed. Discard upload ensures no GPU stall when
reusing the same buffer across shadow and main passes.

- Delete InstanceDataPackerPool.ts
- BatcherManager: instanceDataPackerPool → instanceDataPacker
- Remove resetInstanceDataPackerPool lifecycle
- Saves GPU memory by using single buffer instead of pool

Rename class, file, and all references to better reflect its role as
an instance batch manager rather than a generic data packer.

It's a macro-keyed map, not a pool (no borrow/return semantics).

Align variable and method names with MacroMap rename — these are maps,
not pools.

Callers always pass a valid buffer, no need for null guard.

- nativeBuffer → buffer, _uboData → _data
- Replace separate instanceFields/_structSize with single _layout ref
- setLayout() now takes InstanceLayout directly

- Remove unnecessary null guard on _layout
- Inline uploadElements variable
- Destructure floatView/intView from this
- Improve worldMatrix comment

- Remove unnecessary component→renderer alias, use component directly
- Hoist bindUniformBlocks/bindUniformBufferBase out of sub-batch loop
- Move primitive.instanceCount=0 after loop (only need to reset once)
- Remove redundant let layout = undefined

- Upgrade lint-staged from v10.5 to v16.4.0
- Fix glob from *.{ts} to **/*.ts to match subdirectory files
- Remove redundant git add from tasks

- eslint 8.44 → 8.57
- @typescript-eslint/parser and eslint-plugin 6.x → 8.x
- Eliminates "unsupported TypeScript version" warning

Dispose means the object is permanently released, so null the array
to free memory instead of just clearing length.

Eliminate redundant SubShader._getInstanceLayout / ShaderPass._scanInstanceFields
by reusing the shader compilation chain — _injectInstanceUBO now returns
InstanceLayout directly, stored on ShaderProgram._instanceLayout.

# Conflicts:
#	packages/shader/src/shaders/Transform.glsl