Protocol-based single stub file for submodules#353
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This commit adds a new specification document (docs/submodule.md) that describes how to represent PyO3 submodules in Python stub files. Key changes: - Protocol-based representation: Submodules are represented as typed attributes using typing.Protocol, not as separate importable modules - Single stub file generation: One .so file → one .pyi file for all layouts (Pure Rust and Mixed Python/Rust) - Unique protocol naming: Each submodule gets a unique protocol name (e.g., _SubMod1Protocol, _SubMod2Protocol) to avoid naming conflicts - Alignment with runtime behavior: Accurately reflects PyO3's module structure where submodules are attributes This specification addresses issue #351 and simplifies the stub generation strategy by eliminating the multi-file generation mechanism. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Resolve #351