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/MOLECULES.md

@@ -123,7 +123,7 @@ For reusable workflows, beads uses a chemistry metaphor:
 |-------|------|---------|--------|---------|
 | **Solid** | Proto | `.beads/` | Yes | Frozen template |
 | **Liquid** | Mol | `.beads/` | Yes | Active persistent work |
-| **Vapor** | Wisp | `.beads-wisp/` | No | Ephemeral operations |
+| **Vapor** | Wisp | `.beads/` (Wisp=true) | No | Ephemeral operations |
 
 ### Phase Commands