fix(ci): green up ffi-parity + macOS clustered-lights golden

[proggeramlug]

Greens up the two checks that were red on main since the round-2 branch (they pre-date the lag/flicker session; surfaced on main via the round-2 consolidation merge #83).

ffi-parity

• Regenerated native/watchos/src/ffi_stubs.rs from the manifest via gen_stubs.js. The round-2 FFI additions (numeric profiler ABI, present-mode, sharpen, scene setters, splat, scratch buffers) were added to package.json but the watchOS no-op stubs were never regenerated -> 14 name-coverage failures.
• Added the 16 web-absent functions to the documented WEB_GAP_ALLOWLIST, grouped by reason (profiler needs TIMESTAMP_QUERY absent on WebGPU; present-mode is browser-owned; sharpen joins the existing post-FX gap; scene setters + scratch buffers share the existing Perry-WASM linear-memory TODO; splat_impulse not yet wired).

shared-tests (macOS / Metal)

• golden_many_point_lights_clustered_scene diverges ~4.5/255 mean on Metal (0 outliers, max 19) from the Vulkan/DX reference golden that Linux/Windows match under 2.0 — a uniform fp/accumulation-order difference in the froxel clustered light loop, not a broken region. Added a per-test mean tolerance (6.0 for this scene); the strict global OUTLIER_FRACTION gate is unchanged, so a real regression (localized >32/255 patch) still fails. Regenerating a Metal golden retires the override.

Verified locally: bun tools/validate-ffi.js -> 0 failures; golden test compiles + passes on the Windows backend. Leaving this open for CI (incl. macOS Metal) to confirm green before merge.

Summary by CodeRabbit

• Rendering Improvements
  • Added scene-wide and per-mesh GI/SDF baking updates, including automatic cache invalidation as the camera moves.
• Bug Fixes
  • Improved golden image comparison using scene-specific tolerances to reduce spurious failures across GPUs.
  • Added missing watchOS runtime stubs for additional exported APIs to prevent crashes.
• Chores
  • Expanded web FFI export allowlisting to keep coverage validation aligned with supported interfaces.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: dbfe39c2-4e23-4b33-b420-1eaefe5ec5e2

📥 Commits

Reviewing files that changed from the base of the PR and between 693cf47 and 51f5ce9.

📒 Files selected for processing (2)

• native/shared/src/renderer/gi_bake.rs
• native/shared/src/renderer/mod.rs

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📝 Walkthrough

Walkthrough

This PR updates golden-image tolerance handling, adds missing watchOS FFI stubs plus matching web allowlist entries, and moves renderer GI bake logic into a new submodule with clipmap, WSRC, and per-mesh SDF baking routines.

Changes

Golden Render Tolerance

Layer / File(s)	Summary
Per-scene mean tolerance in golden comparison native/shared/tests/golden_render.rs	compare_or_update now delegates to compare_or_update_tol with a caller-supplied mean tolerance, the mismatch condition and panic message use that value, and the clustered point-lights scene uses mean_tol = 6.0 with comments about Metal divergence.

watchOS FFI Stubs and Web Allowlist

Layer / File(s)	Summary
watchOS FFI stub functions native/watchos/src/ffi_stubs.rs	Adds extern "C" no-op stubs for scratch buffer helpers, material compilation, splat impulse, profiler accessors, bloom rendering config, and scene config.
Web FFI validator allowlist update tools/validate-ffi.js	Adds the corresponding new bloom_* names to WEB_GAP_ALLOWLIST so the web export check accepts them as documented gaps.

Renderer GI Bake Split

Layer / File(s)	Summary
GI bake module wiring native/shared/src/renderer/mod.rs	Declares the gi_bake submodule and removes the inlined GI baking implementation from renderer/mod.rs.
SDF clipmap invalidation and bake native/shared/src/renderer/gi_bake.rs	Adds camera-based clipmap invalidation, scene SDF clipmap bake orchestration, and amortized slice encoding to complete the clipmap volume.
WSRC invalidation and bake native/shared/src/renderer/gi_bake.rs	Adds WSRC cascade invalidation from camera travel and sun/sky hysteresis, then bakes cascades through HW or SW paths with per-frame cascade limits and bookkeeping updates.
Per-mesh SDF bake and cache readback native/shared/src/renderer/gi_bake.rs	Adds bounded per-frame SDF bake dispatch, resource validation, and texture-to-buffer readback scheduling into sdf_cache_writes for later persistence.

Estimated code review effort: 4 (Complex) | ~60 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Renderer
  participant SceneGraph
  participant wgpuCommandEncoder as wgpu::CommandEncoder
  Renderer->>Renderer: maybe_invalidate_sdf_clipmap()
  Renderer->>SceneGraph: bake_scene_sdf_clipmap(scene, encoder)
  Renderer->>wgpuCommandEncoder: encode_clipmap_bake_slices(job, encoder)
  Renderer->>Renderer: maybe_invalidate_wsrc()
  Renderer->>wgpuCommandEncoder: bake_wsrc(encoder)
  Renderer->>SceneGraph: bake_pending_sdfs(scene, encoder)
  Renderer->>wgpuCommandEncoder: copy_texture_to_buffer for sdf cache readback

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main CI and golden-test changes.
Description check	✅ Passed	The description covers the summary, verification, and reviewer notes, though it does not use the exact template headings or checkboxes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-green

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