Skip transparent pixels and quantise while compositing

Much of a layer buffer is often transparent (a stroked ring, a glow-padded
text layer, a precomp canvas), yet every destination pixel sampled it
bilinearly, and 8/16 bpc comps then re-quantised the layer's whole rotated
bounding box.

- Bilinear warps skip 16x16 source tiles whose pixels (and a one-pixel
  apron) all have zero alpha: their samples are transparent and were never
  drawn.
- The fast affine warp reports the rectangle it changed and, given the
  comp's levels, quantises each pixel as it blends it, so draw_comp has
  nothing left to re-quantise for that layer. quantize_px moves to
  effectcraft-raster for this.
- quantize_rect skips runs of four all-zero (+0.0) pixels, which quantise
  to themselves.
- to_rgba8 / to_rgba8_over convert row by row instead of per 4-byte item.

Every pixel stays bit-identical: tests compare the warp against the
reference path, fused quantising against quantising after blending, and
the zero-run skip against per-pixel quantising.

With the previous commit, demo comp to H.264 (`cargo xtask bench --scenario
demo --format h264 --frames 300`, 11 interleaved runs on a 16-thread Ryzen):
wall 9.26 s -> 6.97 s median (-24.8%), 8.55 s -> 6.55 s min (-23.3%); CPU
time -23%. Output byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/render/src/lib.rs

@@ -32,7 +32,7 @@ use effectcraft_effects::{Buf, EffectCtx, EffectEnv, EffectHost, LayerPixels, Pa
 use effectcraft_geom::{Mat3, Mat4, vec2};
 use effectcraft_project::{Comp, Footage, FootageKind, FrameBlend, GroupKind, ItemId, ItemKind, Layer, LayerSource, MatteKind, Project, Quality, Sampling};
 pub use effectcraft_raster::Image;
-use effectcraft_raster::{WarpOpts, composite_warp};
+use effectcraft_raster::{WarpOpts, composite_warp_changed};
 use effectcraft_time::{FrameRate, TICKS_PER_SECOND, Tick};
 pub use eval::{EvalCtx, ExprHost, effect_bounds, source_size};
 use rayon::prelude::*;