OrtEmbedder's tokenize -> tensor build -> mean-pool -> L2-normalize
pipeline was near-byte-identical to breadmill's own OrtEmbedder (same
truncation, same actual_seq.min(mask.len()) padding guard, same 1e-10
epsilon) — now both share bread_onnx::embedding::EmbeddingSession (path
dependency for now, see the TODO in breadarrd/Cargo.toml). This crate
stays CPU-only (Provider::Cpu), matching its existing documented rationale.
ensure_model's reqwest-based download function is replaced with
bread_onnx::download::ensure_file (sync/ureq, matching breadmill's own
downloader and this workspace's bakery convention) dispatched via
spawn_blocking from this async context.
Builds and tests clean across the whole breadarr workspace: 205 passed, 1
pre-existing network-dependent test ignored, 0 failed.
