Hood Chatham

This commit **removes all support for `cf-requirements.txt`** across the project, specifically impacting **Python worker dependency management**. It involves a significant **refactoring** to deprecate and eliminate the legacy mechanism for specifying Python package requirements. The changes span **Wrangler's deployment bundling and development watch processes**, as well as the **Workers Playground's logic for handling worker bundles and draft workers**. This streamlines the codebase by removing outdated functionality, simplifying the dependency resolution process for Python workers, and updating related warning messages.

This commit **stabilizes the `pythonExternalSDK` feature** within the **Workerd runtime** by removing its experimental flag and setting a `$compatEnableDate` of "2026-04-21" in `src/workerd/io/compatibility-date.capnp`. This change officially promotes the **Python external SDK integration** to a stable capability. Furthermore, it improves the **Pyodide integration** by adding a **more informative error message** in `injectWorkersApi` for scenarios where `EXTERNAL_SDK` is enabled but no external SDK is found. The commit also includes **internal refactoring** of `src/pyodide/internal/metadata.ts` and updates to **test configurations** to align with the feature's new non-experimental status.

This commit **enhances the documentation** for **Workers runtime APIs bindings** by integrating **Python code examples** into most code blocks within `bindings/index.mdx`. It also **refactors existing JavaScript examples** by wrapping them in tabbed components for improved presentation. This **documentation enhancement** significantly improves the clarity and utility of the content, particularly for Python developers, by offering language-specific examples and a cleaner, more organized layout.

Fixes failing pytest tests when running with Pyodide 0.26 by correcting an issue with filesystem `stat()` calls on non-directory paths. This is an isolated fix for test infrastructure, with no impact on production systems.

This commit refactors internal Bazel build configurations for Pyodide by centralizing constants. It is an isolated change aimed at improving build script maintainability, with no direct impact on Pyodide functionality or user experience.

This change significantly enhances the security and isolation of the Pyodide environment within Workerd by preventing the loading of dynamically generated shared libraries. This introduces a new restriction, acting as a critical security hardening measure for all Pyodide applications running in this context.

This commit introduces a new `pytest`-based testing framework for Python components within the `workerd/server` module. This significantly enhances the testing capabilities and development workflow for Python code, with no direct impact on production functionality.

This fixes a critical memory corruption bug within Pyodide's internal Python execution environment, preventing crashes and ensuring the stability of Python code running in Pyodide.

This is an isolated fix to the `workerd` Python test infrastructure, specifically addressing an issue with snapshot handling in test configurations. It has no impact on production code or user-facing functionality.

This is an isolated fix to the `create_vendor_zip` utility, ensuring the 'abi' field is correctly represented as `None` instead of the string `"None"`. This prevents potential parsing issues for systems consuming the generated vendor zips.

This is an isolated change to the `workerd` server's Python test suite, refactoring existing tests to reduce overall test execution time. It has no impact on production code or functionality.

This commit refactors the internal logic of the Pyodide build dependency definition, simplifying its implementation. It is an isolated change to the build system with no impact on product functionality or runtime behavior.

Pyodide bzlmod: Use root_module_direct_deps to avoid duplication (#5829)

This commit **enhances the Workers documentation** by integrating a **Python example** for serving static assets. A new tab item has been added to the `src/content/docs/workers/static-assets/index.mdx` file, providing a practical demonstration for Python developers. This **documentation enhancement** expands the available language examples, making the static assets guide more comprehensive and accessible to a broader range of users.

This change introduces a new capability within Pyodide, enabling `import_from_js` modules to be serialized. This enhances Pyodide's state management and interoperability, with implications for how Pyodide-based applications, particularly within Workerd, can persist and restore their state.

This is an isolated change to the `workerd` server's Python test suite, disabling obsolete and time-consuming import tests. It improves test execution efficiency without affecting production code or functionality.

This change optimizes the internal `workerd` Python test suite by caching standard library modules, leading to faster test execution. It is an isolated internal improvement with no impact on production functionality or user-facing features.

This change optimizes Python test execution for the `workerd` server by caching Pyodide bundles, significantly reducing network reliance and improving test run times. It is an isolated improvement to the test infrastructure with no production impact.

This commit introduces a new `patch_env` context manager to the Python workers SDK, providing Python worker developers with a new capability to temporarily modify environment variables. This enhances the flexibility and control over the execution environment for Python applications within Workerd.

Isolated change to the internal `pyodide` snapshot serialization/deserialization logic; this is a nonfunctional refactor improving code organization and types with no impact on external behavior or APIs.