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/molecule-algebra.md

@@ -200,7 +200,7 @@ Work in Gas Town exists in three phases:
 
 **"Is this the work, or is this wrapping the work?"**
 
-| Spawn as Mol when... | Spawn as Wisp when... |
+| Pour when... | Wisp when... |
 |---------------------|----------------------|
 | This IS the work item | This SHAPES execution |
 | Multiple agents coordinate | Single agent executes |
@@ -539,8 +539,8 @@ Still declarative, still mechanical.
 | Operands | Result |
 |----------|--------|
 | proto + proto | compound proto (frozen) |
-| proto + mol | spawn proto as mol, attach |
-| proto + wisp | spawn proto as wisp, attach |
+| proto + mol | pour proto, attach |
+| proto + wisp | wisp proto, attach |
 | mol + mol | link via edges |
 | wisp + wisp | link via edges |
 | mol + wisp | reference link (cross-phase) |
@@ -548,8 +548,8 @@ Still declarative, still mechanical.
 | aspect + molecule | advised molecule |
 
 Phase override flags:
-- `--pour`: Force spawn as mol
-- `--wisp`: Force spawn as wisp
+- `--pour`: Force creation as mol
+- `--wisp`: Force creation as wisp
 
 ## Complete Example: Shiny-Enterprise