terminology: spawn → pour/wisp for molecules (gt-9uy0)

Molecules use chemistry verbs, not spawn:
- pour = create persistent mol (liquid)
- wisp = create ephemeral wisp (vapor)
- spawn = polecats only (workers)

Changes:
- Delete chemistry-design-changes.md (migration doc)
- Remove migration tables from sling-design.md
- Update bond tables: Spawn → Pour/Wisp
- Rename spawnMoleculeFromProto → pourMoleculeFromProto
- Rename spawnMoleculeOnIssue → runMoleculeOnIssue
- Update templates: bd mol spawn → bd wisp
- Update prime.go: commands and messages
- Clean all docs and comments

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

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

docs/propulsion-principle.md

@@ -67,12 +67,12 @@ The **sling** operation puts work on an agent's hook. Here's the full lifecycle:
 │                    gt sling lifecycle                    │
 ├─────────────────────────────────────────────────────────┤
 │                                                          │
-│  1. SPAWN (if proto)     2. ASSIGN           3. PIN     │
+│  1. POUR (if proto)      2. ASSIGN           3. PIN     │
 │     proto → molecule        mol → agent         → hook  │
 │                                                          │
 │  ┌─────────┐            ┌─────────┐        ┌─────────┐  │
 │  │  Proto  │ ────────►  │Molecule │ ─────► │  Hook   │  │
-│  │(catalog)│   spawn    │(instance)│ assign │(pinned) │  │
+│  │(catalog)│   pour     │(instance)│ assign │(pinned) │  │
 │  └─────────┘            └─────────┘        └─────────┘  │
 │                                                  │       │
 │                                            agent wakes   │