feat: pin wasm-bindgen-cli to 0.2.122

[thedavidmeister]

nixpkgs' default wasm-bindgen-cli (0.2.117) lags the wasm-bindgen crate version current lockfiles resolve to (0.2.122). The CLI and crate must match exactly or Error: executing wasm-bindgen over the Wasm file — this broke rain.wasm's rs-wasm-test and blocked its 0.1.0 publish.

Pin the CLI to 0.2.122 via nixpkgs' buildWasmBindgenCli (fetchCrate + fetchCargoVendor with discovered hashes) — no nixpkgs bump, no other tool-version churn. Verified: nix develop -c wasm-bindgen --version → 0.2.122.

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 2d60486 and 5229d25.

📒 Files selected for processing (2)

• CLAUDE.md
• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-26-wasm-bindgen-0-2-122

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