Clarifies the identity model:
- Human identity is global (email from git author)
- Polecats are ephemeral executors, not persistent identities
- Skills are derived from work evidence, not stored
- Multi-town aggregation via email
See docs/hop/decisions/008-identity-model.md for rationale.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>