Add Chromium-only Blender WebEngine parity work

docs/decisions/000-baseline.md

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+# Web Blender Baseline
+
+## Scope
+
+This baseline fixes the source and toolchain for the first Web implementation. The
+Blender source tree remains an upstream dependency; Web-specific code belongs in
+new `web/`, `tools/web/`, `docs/`, and `tests/` paths.
+
+## Source
+
+| Item | Value |
+| --- | --- |
+| Web source directory | `blender-5.2.0/` |
+| Source archive | `blender-5.2.0.tar.xz` |
+| Source archive MD5 | `ec40a0ad895131a0fd3d360a59fd599a` |
+| Reference Git checkout | `blender/` |
+| Reference Git commit | `fbe6228777e7d9afefcd61a413844e790ae75db7` |
+| Reference checkout state | dirty before Web work; pre-existing changes are out of scope |
+| Existing native build | `build_blender_5.2.0/` |
+
+The reference checkout is intentionally not clean. No existing Blender source,
+asset, or test file is reverted by the Web implementation.
+
+## Toolchain
+
+| Tool | Version |
+| --- | --- |
+| OS | Linux x86_64, kernel 6.12.95+deb13-amd64 |
+| CMake | 3.31.6 |
+| Ninja | 1.12.1 |
+| Emscripten | 3.1.69 |
+| Node.js | 20.19.2 |
+| npm | 9.2.0 |
+| pnpm | unavailable at baseline; npm is the bootstrap fallback |
+
+## Build isolation
+
+- Native builds use `build_blender_5.2.0/` or a separately named native build tree.
+- Web builds use `build_web/` and must not reuse native CMake cache files.
+- Browser packages are emitted under `web/dist/` and are not copied into the
+  Blender source tree.
+
+## Baseline checks
+
+The baseline is accepted when the native binary reports Blender 5.2.0, the source
+and archive paths exist, and the Web toolchain versions above are recorded in the
+task status file.