chore: migrate remaining config singleton uses in transform.py, db.py, status.py

[JesuFemi-O]

Context

#172 migrated the four ingestion command modules (sources.py, run_all.py, sync_cmd.py, explore.py) away from the module-level config singleton to load_config() constructed at invocation time.

Three modules still import the singleton directly:

• src/tycoon/commands/transform.py
• src/tycoon/commands/db.py
• src/tycoon/commands/status.py

The tell is test_templates_e2e.py::_rebind_config, which still needs to patch both transform_mod.config and cfg_mod.config to make e2e tests work.

Goal

Migrate these three modules to load_config() following the same pattern as #172, and drop the remaining monkeypatch.setattr calls from _rebind_config.

Depends on

#172