fix: enforce fresh context between molecule steps

Change molecule step completion instructions to use `gt mol step done`
instead of `bd close`. This ensures polecats get fresh context between
each step, which is critical for multi-step review workflows like
shiny-enterprise where each refinement pass should have unbiased attention.

The `gt mol step done` command already:
1. Closes the step
2. Finds the next ready step
3. Respawns the pane for fresh context

But polecats were being instructed to use `bd close` directly, which
skipped the respawn and let them run through entire workflows in a
single session with accumulated context.

Updated:
- prime_molecule.go: step completion instructions
- mol-polecat-work.formula.toml
- mol-polecat-code-review.formula.toml
- mol-polecat-review-pr.formula.toml

Fixes: hq-0kx7ra

internal/cmd/prime_molecule.go

@@ -88,9 +88,9 @@ func showMoleculeExecutionPrompt(workDir, moleculeID string) {
 		fmt.Println(style.Bold.Render("→ EXECUTE THIS STEP NOW."))
 		fmt.Println()
 		fmt.Println("When complete:")
-		fmt.Printf("  1. Close the step: bd close %s\n", step.ID)
-		fmt.Println("  2. Check for next step: bd ready")
-		fmt.Println("  3. Continue until molecule complete")
+		fmt.Printf("  gt mol step done %s\n", step.ID)
+		fmt.Println()
+		fmt.Println("This closes the step and respawns your session with fresh context for the next step.")
 	} else {
 		// No next step - molecule may be complete
 		fmt.Println(style.Bold.Render("✓ MOLECULE COMPLETE"))
@@ -162,11 +162,10 @@ func outputMoleculeContext(ctx RoleContext) {
 		showMoleculeProgress(b, rootID)
 
 		fmt.Println()
-		fmt.Println("**Molecule Work Loop:**")
-		fmt.Println("1. Complete current step, then `bd close " + issue.ID + "`")
-		fmt.Println("2. Check for next steps: `bd ready --parent " + rootID + "`")
-		fmt.Println("3. Work on next ready step(s)")
-		fmt.Println("4. When all steps done, run `gt done`")
+		fmt.Println("**When step complete:**")
+		fmt.Println("  `gt mol step done " + issue.ID + "`")
+		fmt.Println()
+		fmt.Println("This closes the step and respawns with fresh context for the next step.")
 		break // Only show context for first molecule step found
 	}
 }