[antosubash]

Summary

• host/alembic.ini and the alembic.ini that smpy new scaffolds now set path_separator = os. Alembic then splits prepend_sys_path and version_locations on the OS path separator.
  • Without the line, a host that adds either option gets a DeprecationWarning on every migration command, and a checkout path with a space is split in two.
  • smpy_modules hit both problems.
• New framework/cli/tests/test_cli_alembic_ini.py. For each ini, it copies the file into a directory whose name has a space and sets a two-entry prepend_sys_path. It expects no warning, with warnings raised as errors, and two whole paths. It fails without the line.
• CHANGELOG: an existing app on Alembic 1.16 or newer can add the same line.

Closes #872

Verification

• make ci-doctor ✓: it migrates and runs alembic check through host/alembic.ini.
• Local CI: make lint ✓, make test-py ✓ (8323), make test-js ✓ (906).
• Reviewed by correctness and maintainability reviewers (one CHANGELOG fix) and by Codex, which found nothing.
• Verification report: https://claude.ai/artifact/J4qmzXpjffc4iHiVjSJnLs

Report links are Claude Artifacts and start private — the author can share them
from claude.ai/code/artifacts if reviewers need access.

Test plan

• make migrate and make migration still work
• CI is green

[chatgpt-codex-connector]

Codex Review Summary: ✅ Completed

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
🔒 Security Review	✅ Completed 2026-11-11T00:44:54.790105Z	41c40d6	PR opened

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