Establish the engineering quality baseline

[edison7009]

What changed

• Track the portable project memory, design guidance, agent rules, and referenced engineering documentation.
• Establish a clean Rust formatting and strict Clippy baseline.
• Add daily frontend and Rust quality checks for pull requests and pushes to main.

Why

The repository previously ran quality checks only for release tags, while key documentation was ignored and unavailable on other machines. This gives Coffee Note a portable source of truth and catches regressions before release.

Validation

• npm run typecheck
• npm test — 138 passed
• npm run library:check
• npm run release:check
• npm run build
• cargo fmt --manifest-path src-tauri/Cargo.toml -- --check
• cargo clippy --manifest-path src-tauri/Cargo.toml --locked --all-targets -- -D warnings
• cargo test --manifest-path src-tauri/Cargo.toml --locked — 143 passed

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