fix: split language package layout

[konard]

Fixes #77

Summary

• Move the WebAssembly Rust wrapper crate from the repository root into rust/wasm/, including Cargo.toml, Cargo.lock, src/, and tests/.
• Split release automation by package: C# Node scripts now live in csharp/scripts/; Rust automation now lives in rust/scripts/ as rust-script scripts with crates.io publish/release checks.
• Update C#, Rust, and WebAssembly workflows, npm scripts, docs, package READMEs, registry/release badges, and release metadata for the split layout.
• Preserve issue/PR/template/CI evidence in docs/case-studies/issue-77/.

Reproduction and Regression Coverage

• Added web/test/repositoryLayout.test.mjs, which fails on the old layout by requiring root Cargo.toml, Cargo.lock, scripts/, src/, and tests/ to be absent and requiring csharp/scripts/, rust/scripts/, and rust/wasm/ to exist.
• The regression also checks the relocated WebAssembly npm commands and the corrected wasm-pack test --node rust/wasm argument order.

Verification

• node --test web/test/repositoryLayout.test.mjs
• npm run test:js
• npm run test:wasm
• npm run build
• npm test
• cargo fmt --manifest-path rust/Cargo.toml --all -- --check
• cargo fmt --manifest-path rust/wasm/Cargo.toml --all -- --check
• rustfmt rust/scripts/*.rs --check
• cargo test --manifest-path rust/Cargo.toml --all-features
• cargo test --manifest-path rust/wasm/Cargo.toml --all-features
• cargo clippy --manifest-path rust/Cargo.toml --all-targets --all-features
• cargo package --manifest-path rust/Cargo.toml --list --allow-dirty
• rust-script rust/scripts/get-version.rs --rust-root rust
• rust-script rust/scripts/get-bump-type.rs --rust-root rust
• rust-script rust/scripts/check-file-size.rs
• rust-script rust/scripts/check-changelog-fragment.rs
• rust-script --test rust/scripts/check-file-size.rs
• rust-script --test rust/scripts/create-github-release.rs
• dotnet test csharp/Foundation.Data.Doublets.Cli.sln --configuration Release
• git diff --cached --check

Notes

• This is not a UI change, so no screenshots are included.
• Existing stale CI failures investigated for this issue are preserved under docs/case-studies/issue-77/evidence/; latest main runs were passing before this branch change.

[konard]

Working session summary

Implemented and pushed the fix for issue 77.

PR 78 is ready: #78
Head commit: b4b0f02 (fix: split language package layout)

What changed:

• Moved the WASM crate from root into rust/wasm/.
• Split release scripts into csharp/scripts/ and rust/scripts/.
• Updated C#, Rust, and WebAssembly workflows and package scripts.
• Added package READMEs, badges, changelog/changeset entries, and issue evidence.
• Added web/test/repositoryLayout.test.mjs to prevent root Cargo.toml, scripts/, src/, or tests/ from coming back.

Verification:

• Local JS, WASM, Rust, C#, rust-script, package, and build checks passed.
• Fresh PR CI passed for C#, Rust, and WebAssembly.
• PR is no longer draft and merge state is clean.
• Working tree is clean.

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[konard]

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[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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