[jaredchu]

What this changes

Fixes the Python package and CLI failures reported in #70 and #71:

• Explicitly package the mapped kerneta_engine directory so wheels and source distributions include the engine.
• Add the engine directory to the CLI import path before running engine scripts, allowing update and watch to resolve their sibling imports.
• Add five isolated regression tests covering distribution contents, installed doctor, an actual build/update edit, watch detecting an edit and stopping on SIGINT, and source CLI fallback.
• Add Python CI on Ubuntu and macOS with Python 3.10 and 3.12. Refresh the three existing manifest hashes affected by these changes.

Why

Installed wheels currently omit the engine (#70). With the engine present, update and watch fail on flat sibling imports (#71). The regressions build distributions from copied source and exercise the installed CLI from an unrelated directory in a fresh environment.

Fixes #70. Fixes #71.

Validation

• All five Python tests passed on macOS with Python 3.10 and 3.12, and independently on Linux arm64 with Python 3.10.
• Restoring broken package discovery caused four expected regression failures; removing the CLI import-path fix caused three.
• npm run check: 18 passed; npm run verify: 916 passed; mock npm run selftest: 14 passed. Published-number check found no drift.
• The existing Node CI job is unchanged. The new hosted Python matrix will cover x64 runners; local Linux validation used arm64.

Checklist

• Commits are signed off (git commit -s). No CLA, DCO only. See CONTRIBUTING.md.
• npm run verify and npm run check pass, free and offline.
• No .dai store, key or *.daidocs-bak file is included (git status checked).

Reader and prompt impact

This patch does not change the reader, ingest prompt or shipped prompts.

[patricklenert]

👍🏻