Add link to native REPL information

[Eduardo Villalpando Mello (edvilme)]

Fixes #24754

This pull request refactors how shell integration sequences are managed in python_files/pythonrc.py by introducing a dedicated ShellIntegrationSequence enum, and updates related string formatting to use this enum. It also updates user-facing messages in both the Python startup script and the VS Code terminal link provider to include a documentation URL. These changes improve maintainability, clarity, and user guidance.

Shell integration refactoring:

• Introduced the ShellIntegrationSequence enum to centralize shell integration control sequences, replacing hard-coded string literals throughout the code. [1] [2]
• Refactored the __str__ method in the prompt class to use the new enum values, improving readability and reducing duplication.

User guidance improvements:

• Updated the printed startup message in pythonrc.py to include a documentation URL, guiding users to more information about the VS Code Native REPL.
• Updated the expected link text in pythonStartupLinkProvider.ts to match the new message format (excluding the URL), ensuring the link detection logic remains consistent with the Python script output.

[Bill Schnurr (bschnurr)]

🔒 Automated review in progress — Bill Schnurr (@bschnurr) is auto-reviewing this PR.

[Bill Schnurr (bschnurr)]

Verification: The relevant tests could not be fully run in the isolated environment; this review is not fully verified.

Result: could-not-verify

Summary: Verification could not run because no trusted sandbox image is configured for `microsoft/vscode-python`, and local execution was not authorized. The PR modifies existing Python and TypeScript tests but adds no new test cases. Linux startup-message behavior lacks coverage because the non-Darwin print test is restricted to Windows.

Test runs: 1 not run

• ⚠️ Not run | Dependency and test discovery preflight | git status --short && git branch --show-current && git diff --name-status upstream/main...HEAD && git diff --unified=0 upstream/main...HEAD -- python_files/tests/test_shell_integration.py src/test/terminals/shellIntegration/pythonStartup.test.ts && echo AUTOMATION_SANDBOX_PROFILE=$AUTOMATION_SANDBOX_PROFILE && if [ -d node_modules ]; then echo node_modules=present; else echo node_modules=missing; fi && python --version && node --version && npm --version

⚠️ Dependency and test discovery preflight diagnostic output

Container verification could not start: no trusted sandbox image is configured for microsoft/vscode-python. Local execution was not authorized for this PR HEAD.

[Bill Schnurr (bschnurr)]

Approved via Review Center.