Removed dual-routing architecture that used separate .beads-wisp/ directory.
Now uses single .beads/ with --wisp flag passed to bd create.
Changes:
- router.go: Remove resolveWispDir(), simplify shouldBeWisp()
- mailbox.go: Remove wispDir field and dual-source query logic
- types.go: Rename Ephemeral to Wisp, remove MessageSource
- mail.go: Rename --ephemeral to --wisp flag
- spawn.go: Use Wisp field for lifecycle messages
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>