When GT_ROLE env var is not set, detectSender() now falls back to
cwd-based detection instead of immediately returning "overseer".
This allows running mail commands from witness/refinery directories
without GT_ROLE set (e.g., debugging sessions) and correctly detecting
the identity from the current working directory path.
(gt-od1g)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>