Delete legacy Go-defined molecules (gt-ingm.3)

Molecules are now defined as formula files in .beads/formulas/ and
cooked into proto beads via `bd cook`. This removes:

- molecules_patrol.go (695 lines)
- molecules_session.go (544 lines)
- molecules_work.go (444 lines)
- builtin_molecules_test.go
- christmas_ornament_test.go

Updates:
- builtin_molecules.go: stub deprecated functions
- install.go: remove molecule seeding (formulas are cooked on-demand)

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

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

internal/cmd/install.go

@@ -10,7 +10,6 @@ import (
 	"time"
 
 	"github.com/spf13/cobra"
-	"github.com/steveyegge/gastown/internal/beads"
 	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/style"
 	"github.com/steveyegge/gastown/internal/templates"
@@ -173,13 +172,6 @@ func runInstall(cmd *cobra.Command, args []string) error {
 			fmt.Printf("   %s Could not initialize town beads: %v\n", style.Dim.Render("⚠"), err)
 		} else {
 			fmt.Printf("   ✓ Initialized .beads/ (town-level beads with gm- prefix)\n")
-
-			// Seed built-in molecules
-			if err := seedBuiltinMolecules(absPath); err != nil {
-				fmt.Printf("   %s Could not seed built-in molecules: %v\n", style.Dim.Render("⚠"), err)
-			} else {
-				fmt.Printf("   ✓ Seeded built-in molecules\n")
-			}
 		}
 	}
 
@@ -253,10 +245,3 @@ func initTownBeads(townPath string) error {
 	return nil
 }
 
-// seedBuiltinMolecules creates built-in molecule definitions in the beads database.
-// These molecules provide standard workflows like engineer-in-box, quick-fix, and research.
-func seedBuiltinMolecules(townPath string) error {
-	b := beads.New(townPath)
-	_, err := b.SeedBuiltinMolecules()
-	return err
-}