Fix environment capture to only capture value bindings
- Filter identifiers in capture_runtime_values to only capture values,
not exceptions, modules, or types. This prevents "Fatal error: X unbound
at toplevel" messages from Toploop.getvalue.
- Change environment logging from INFO to DEBUG level
- Change unix_worker log level from INFO to WARNING
- Update test expected outputs
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>