Use production syntax highlighting grammars

[0xtlt]

What changed

• remove the compact, project-specific Rust grammar override;
• use Typst's complete Syntect/two-face catalog with the native Oniguruma backend;
• add a precompiled Liquid TextMate grammar with embedded HTML, CSS, JSON, and JavaScript dependencies;
• keep unknown language identifiers on a safe plain-text fallback;
• retain jemalloc and early Typst-engine release from the profiling pass;
• document the architecture, tested identifiers, visual fixture, and updated benchmarks.

Impact

HTML, CSS, Liquid, JavaScript, TypeScript, JSON, YAML, TOML, Python, Rust, Go, Java, C/C++, Bash, and SQL are explicitly verified. Default code blocks remain free of line numbers.

Compared with version 3.0.1, version 3.2 lowers median conversion time by 38–58%, peak RAM by 9–22%, and CPU cycles by 35–53%. The former version 3.1 Rust fast path was deliberately removed because it was not the general-purpose highlighting architecture required by the project.

Validation

• cargo fmt --check
• cargo clippy --all-targets --all-features --locked -- -D warnings
• cargo test --locked (18 tests)
• RUSTDOCFLAGS='-D warnings' cargo doc --no-deps --locked
• optimized release build and ad-hoc code-sign verification
• 1-, 40-, and 240-page performance/resource fixtures
• PDF 1.7 parsing and text extraction
• rendered one-page HTML/CSS/Liquid/JavaScript/Python/Rust visual fixture
• default line-number behavior verified

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