refactor: Simplify wisp architecture - badges not separate storage

Wisps are now just issues with Wisp=true flag in the main database,
not exported to JSONL. Removes all references to .beads-wisp/ directory.

- Update docs: CLAUDE.md, CLI_REFERENCE.md, MOLECULES.md, DELETIONS.md
- Update code comments: wisp.go
- Update changelog and info.go version notes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/CLI_REFERENCE.md

@@ -351,7 +351,7 @@ Beads uses a chemistry metaphor for template-based workflows. See [MOLECULES.md]
 |-------|-------|---------|---------|
 | Solid | Proto | `.beads/` | `bd mol catalog` |
 | Liquid | Mol | `.beads/` | `bd pour` |
-| Vapor | Wisp | `.beads-wisp/` | `bd wisp create` |
+| Vapor | Wisp | `.beads/` (Wisp=true, not exported) | `bd wisp create` |
 
 ### Proto/Template Commands