Changes mail identity format from hyphenated (gastown-Toast) to
slash-based (gastown/polecats/Toast) to:
- Match directory structure (REST-like)
- Distinguish from hyphenated bead IDs (gt-xyz) and molecule names
Updated:
- addressToIdentity(): preserve slashes instead of replacing with dashes
- identityToAddress(): simplified, identity == address now
- detectSender(): include /polecats/ in polecat addresses
- Tests updated for new format
Closes gt-cxtu: shared beads architecture verified working.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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