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Migration from varmgr

Before (varmgr) After (varstore)
from lib.store import ... from varstore import ...
VarMgrError / VarMgrAppError / VarMgrUserError VarStoreError / VarStoreAppError / VarStoreUserError
pip install git+...python-expandvars@develop not needed — engine is vendored

Behavior of sources, scopes, layers, priority, and expand syntax is unchanged.