[elyerinfox]

Code-only hygiene pass. The CI gate is a separate small PR that follows this one.

Submodule bump (every codec repo, now on its develop head)

• Example binaries now have crate-prefixed names: bench -> <crate>_bench, kernels -> mpeg2_kernels / prores_kernels, ivfenc/ivfdec -> av1_* / vp9_*, and so on. cargo build --workspace --all-targets no longer links two same-named binaries into target/<profile>/examples, which failed on Windows with LNK1104 when parallel links raced on the same .exe.
• One mechanical cargo fmt --all commit per repo. Hand-aligned data tables keep their layout under #[rustfmt::skip].
• Every repo is clippy-clean under --all-targets --all-features -D warnings. h26x was the only one with findings (about 310).
  • Most were fixed outright. Three pervasive style lints are allowed crate-wide, each with a reason.
  • The h26x changes were checked bit-exact: all 427 conformance streams decode to the same MD5s, and so do all fixtures at every SIMD rung. The encoder identity grid matched in 1127/1127 cells.
• Each codec repo's CI lint job now runs cargo fmt --all --check and clippy with --all-features.

This repo

• cargo fmt --all, a mechanical commit on its own.
• Clippy is clean for --workspace --all-targets -D warnings with every feature that builds without hardware or a CUDA toolkit. dpir-cuda and dpir-cudnn need nvcc and are left out.
  • 141 findings: most fixed, a few allowed at the item, and two narrow crate-level allows. The commit message has the list and a reason for each allow.