tsdhn CLI never configures logging — INFO/DEBUG messages are silently dropped

[totallynotdavid]

api/main.py and api/worker.py both call logging.basicConfig() on startup, so the FastAPI/worker path already logs correctly.

packages/tsdhn/tsdhn/cli/main.py never configures logging at all. Python's root logger defaults to WARNING with no handler attached, so every logger.info/logger.debug call reachable from a plain tsdhn ... invocation (calculator.py, engine.py, render/*.py, etc.) is silently swallowed — none of it reaches the terminal.

• Add a logging.basicConfig() (or a small setup_logging() helper) to cli/main.py, gated by a --verbose/-v flag or a TSDHN_LOG_LEVEL env var
• Confirm it doesn't collide with the rich Console output the CLI already uses for progress bars

[totallynotdavid]

Rewrote with current findings: this predates the API/worker split, and that half of the codebase already configures logging correctly. The remaining gap is scoped to the CLI entry point specifically.