Optimize generated binding layout

[leileizhang (lei9444)]

Summary

• Add opt-in shared required-interface prototype descriptors with --shared-interface-members.
• Add a bundle subcommand for canonical CommonJS dependency bundles.
• Preserve existing declarations, raw interface wrappers, overload dispatch, deep imports, and module identity.
• Keep both optimizations disabled by default.

Shared interface members

Generated concrete classes currently duplicate inherited interface getter, setter, and method implementations.

With --shared-interface-members, compatible members reuse descriptors from canonical interface prototypes:

• conflicting and overloaded members remain class-local;
• raw interface wrappers remain available;
• generated .d.ts files remain unchanged;
• default generation behavior is unaffected.

Binding bundles

The new command bundles configured roots and their generated relative dependency closure:

dynwinrt-codegen bundle --output .winapp\bindings --bundle first-screen=Application,Window,Button,lifetime

It:

• preserves external runtime imports and CommonJS cycle semantics;
• replaces bundled per-type files with canonical redirect shims;
• preserves root/deep CommonJS and ESM constructor identity;
• keeps existing  .d.ts  import paths;
• supports multiple non-overlapping bundles.

For safety, bundling requires a fresh, unbundled output directory. Existing bundle artifacts, missing roots, unsafe inventory paths, and conflicting ownership fail explicitly.

Compatibility

Both features are opt-in:

• generation without  --shared-interface-members  is unchanged;
• bindings are not bundled unless the  bundle  command is executed;
• Python generation is unaffected.

Gallery measurements

Combined shared-interface and first-screen bundle layout:

• per-type generated JS: 46.8 MB → 24.6 MB;
• first-screen implementation files: 882 → 1 bundle plus redirect shims;
• existing declaration files remained byte-identical.

[github-actions]

Mixed-language test coverage

Workflow status: ✅ Passed

Layer	Lines	Functions	Branches/regions
Rust, including native .pyd/.node	80.7%	77.11%	80.6% regions
Generated Python projections	58.64%	n/a	2.53% branches
JavaScript aggregate	18.19%	19.58%	50.75% branches
JavaScript runtime	19.36%	14.28%	7.14% branches
Generated WinRT projections	22.27%	20.02%	52.85% branches
Generated Classic COM projections	11.25%	18.08%	45.94% branches

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