Restore tunacode.cli.main Import Compatibility

Restore tunacode.cli.main Import Compatibility

Summary

Release validation exposed that tunacode.cli.main no longer existed after the CLI entrypoint moved to tunacode.ui.main, breaking import checks and any downstream scripts using the old path. We added a small compatibility shim that re-exports the Typer app and aligned linted isinstance checks with PEP 604 unions to keep release tooling green.

Context

• File: src/tunacode/cli/main.py
• Symptom: ModuleNotFoundError on from tunacode.cli.main import app during release testing.

Root Cause

The CLI entrypoint was consolidated under tunacode.ui.main without leaving a compatibility package for the previous import path, so older references failed at import time.

Changes

• Added a tunacode.cli package with a main.py shim that re-exports app from tunacode.ui.main.
• Re-exported app in tunacode.cli.__init__ for convenience.
• Swapped tuple-based isinstance checks to PEP 604 union syntax to satisfy ruff pre-flight checks.

Behavioral Impact

• tunacode.cli.main imports now resolve without errors.
• CLI behavior remains unchanged because the entrypoint still delegates to tunacode.ui.main.

Related Cards

• [[cli-entrypoint]]