Add database backend vtable roadmap (planned)

Fix 13 audit findings in image/texture code

Fix Lua lint: add image global, fix unused variable

Add texture/image examples, WASM image helpers, update all docs

Fix JS texture desc parser forward declaration signature

Fix GPU texture build: forward declarations for texture desc parsers

Fix GPU texture build: add forward declarations for texture functions

Add GPU texture support: persistent textures, dispatch binding, readback

Fix CI: add MSan flags for stb, exclude stb from scan-build

Add image module: codec vtable, stb_image, Lua/JS bindings

Fix 9 audit findings: allocator mismatch, linker allowlist, UDF leaks

Fix UDF destroy callbacks: don't access dead Lua/JS runtime

Add UDF example app, document UDFs and streaming in README/CLAUDE/AGENTS

Add db.udf: SQL user-defined functions backed by Lua/JS or WASM

Update Phase 9 design: db.udf API, Lua/JS + WASM backends, async limits