Machine elaborate bijou32 and bijou128

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[Copilot]

Pull request overview

This PR adds two new sibling crates to the bijou family — bijou32 (narrower, u32, max 5 bytes, tag threshold 252) and bijou128 (wider, u128, max 17 bytes, tag threshold 240) — together with their wasm/JS counterparts (bijou32_wasm, bijou128_wasm). It also updates the workspace metadata, dev tooling (Nix flake commands), CI workflows, and the bijou64 spec to document the new width variants and the per-tier tag-threshold choice. The three width variants are intentionally not wire-compatible; each picks the widest tag threshold its tier count permits to maximize the single-byte tier.

Changes:

• New bijou32 and bijou128 Rust crates (lib + SPEC + README + examples + tests), mirroring the bijou64 design with adapted tier counts and offsets.
• New bijou32_wasm and bijou128_wasm crates with wasm-bindgen bindings (number-based for u32, bigint-based for u128), plus Node Mocha tests and Playwright cross-browser tests.
• Workspace, Nix flake, and CI updates: members/dependencies wired in; bodge:32, bodge:128, test:js:32*, test:js:128* commands; CI matrix expanded over all three wasm crates.

Reviewed changes

Copilot reviewed 42 out of 45 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Documents the three-crate family, wire-incompatibility, and the differing JS boundary types.
Cargo.toml	Registers the four new crates as workspace members and dependencies.
Cargo.lock	Records resolved versions for the new crates.
flake.nix	Adds bodge:32/bodge:128 build commands, test:js:32*/test:js:128* runners, and extends test:no_std + ci over all three widths.
bijou64/SPEC.md	Replaces "Future Extensions" with a "Width Variants" section explaining per-variant tag thresholds.
bijou32/{Cargo.toml,SPEC.md,README.md,src/lib.rs,examples/decode.rs}	New u32 crate: spec, docs, encode/decode/iterator/EncodedBytes API, and a full test suite.
bijou128/{Cargo.toml,SPEC.md,README.md,examples/decode.rs}	New u128 crate package, spec, docs, and example (lib source not shown in diff).
bijou32_wasm/*	Wasm bindings using JS number; src (lib/encode/decode), Rust wasm tests, Mocha+Playwright JS tests, package metadata, tsconfig, mocharc.
bijou128_wasm/*	Wasm bindings using JS bigint; src (lib/encode/decode), Rust wasm tests, Mocha+Playwright JS tests, package metadata, tsconfig, mocharc.
.github/workflows/test-wasm.yml	Matrixes the wasm-pack and JS-package jobs over bijou32_wasm, bijou64_wasm, bijou128_wasm.
.github/workflows/test-all-features.yml	Adds no_std checks for bijou32 and bijou128.

Files not reviewed (2)

• bijou128_wasm/pnpm-lock.yaml: Language not supported
• bijou32_wasm/pnpm-lock.yaml: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 54 out of 57 changed files in this pull request and generated no new comments.

Files not reviewed (2)

• bijou128_wasm/pnpm-lock.yaml: Language not supported
• bijou32_wasm/pnpm-lock.yaml: Language not supported