refactor(moonutil): convert package DSL directly to MoonPkg

[Yu-zh]

moon.pkg conversion currently reconstructs a MoonPkgJSON before producing MoonPkg, coupling DSL conversion to the legacy JSON package schema. Decode the normalized DSL fields directly into MoonPkg, while retaining the existing Dsl representation and the separate converter for moon.pkg.json.

Normalize declarations and legacy option overrides in one helper, then read the resulting map immutably. Field decoding deserializes borrowed values and preserves option aliases, type checks, and duplicate-field errors. Share package-kind resolution, formatter defaults, import warnings, and rule validation between the two converters.

Compatibility tests compare package values, supported-target declaration metadata, and warnings across equivalent DSL and JSON inputs.

Validation:

• cargo test --locked -p moonutil: 293 passed; one existing ignored doctest.
• test_moon_pkg_normalizes_import_blocks: actual Wasm execution and generated-C dry-run coverage.
• cargo clippy -p moonutil --locked --all-targets --all-features -- -D warnings.
• cargo fmt --all -- --check and git diff --check.

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/moonutil/src/moon_pkg/parser.rs	29% smaller
crates/moonutil/src/package.rs	9% smaller
docs/dev/reference/modules-packages.md	Unsupported file format

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-20T08:40:33.053659Z	398265e	Draft marked ready

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.