Fix Python docstring escaping and namespace imports

[hardbyte]

Summary

• Escape embedded double quotes in generated Python docstrings so schema descriptions cannot break string literals.
• Fix split Python namespace generation so child and peer namespace aliases are bound before generated model classes need them.
• Defer Pydantic model rebuilds until package-level imports have loaded the generated modules.
• Refresh the generated demo Python client and accepted snapshots affected by the deferred-model output.

Why

Generated Python clients could fail to import when schemas contained quote-heavy descriptions or when generated type hints crossed split namespace modules. The namespace issue shows up in larger clients where a model references a child or peer namespace before that namespace has been imported and rebound in the package.

Coverage

• Regression coverage for docstring quote escaping.
• Regression coverage for child namespace binding, peer namespace cycles, namespace aliases in generated references, builtin-shadowing namespace names such as input, and deferred model rebuilds.
• Demo generated Python client snapshot plus Rust and Python snapshot updates to keep codegen drift checks honest.

Validation

• GitHub Actions on ee6016f: Rust format, lint, and test; Python runtime tests; Python codegen smoke test; documentation examples; and documentation preview all passed. The docs deploy job is skipped as expected for this PR.
• Local validation used while preparing the branch: cargo fmt --check, cargo clippy --workspace --all-targets -- -D warnings, cargo test --workspace, and importing the generated demo Python client.

Fixes #156.

[claude]

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[github-actions]

📖 Documentation Preview: https://reflectapi-docs-preview-pr-157.partly.workers.dev

Updated automatically from commit 3512267