Update documentation for bd mol pour/wisp command structure

Updated all documentation and help text to reflect:
- bd pour → bd mol pour
- bd ephemeral → bd mol wisp
- bd ephemeral list → bd mol wisp list
- bd ephemeral gc → bd mol wisp gc

Files updated:
- docs/MOLECULES.md
- docs/CLI_REFERENCE.md
- docs/ARCHITECTURE.md
- docs/DELETIONS.md
- skills/beads/references/MOLECULES.md
- cmd/bd/mol_catalog.go
- cmd/bd/mol_current.go
- cmd/bd/mol_distill.go
- cmd/bd/cook.go

docs/DELETIONS.md

@@ -202,7 +202,7 @@ The 1-hour grace period ensures tombstones propagate even with minor clock drift
 
 ## Wisps: Intentional Tombstone Bypass
 
-**Wisps** (ephemeral issues created by `bd ephemeral create`) are intentionally excluded from tombstone tracking.
+**Wisps** (ephemeral issues created by `bd mol wisp`) are intentionally excluded from tombstone tracking.
 
 ### Why Wisps Don't Need Tombstones