refactor: remove unused bd pin/unpin/hook commands (bd-x0zl)

Analysis found these commands are dead code:
- gt never calls `bd pin` - uses `bd update --status=pinned` instead
- Beads.Pin() wrapper exists but is never called
- bd hook functionality duplicated by gt mol status
- Code comment says "pinned field is cosmetic for bd hook visibility"

Removed:
- cmd/bd/pin.go
- cmd/bd/unpin.go
- cmd/bd/hook.go

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

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

cmd/bd/cook.go

@@ -157,6 +157,15 @@ func runCook(cmd *cobra.Command, args []string) {
 		resolved.Steps = formula.ApplyAdvice(resolved.Steps, resolved.Advice)
 	}
 
+	// Apply inline step expansions (gt-8tmz.35)
+	// This processes Step.Expand fields before compose.expand/map rules
+	inlineExpandedSteps, err := formula.ApplyInlineExpansions(resolved.Steps, parser)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error applying inline expansions: %v\n", err)
+		os.Exit(1)
+	}
+	resolved.Steps = inlineExpandedSteps
+
 	// Apply expansion operators (gt-8tmz.3)
 	if resolved.Compose != nil && (len(resolved.Compose.Expand) > 0 || len(resolved.Compose.Map) > 0) {
 		expandedSteps, err := formula.ApplyExpansions(resolved.Steps, resolved.Compose, parser)
@@ -344,7 +353,7 @@ func runCook(cmd *cobra.Command, args []string) {
 	if len(bondPoints) > 0 {
 		fmt.Printf("  Bond points: %s\n", strings.Join(bondPoints, ", "))
 	}
-	fmt.Printf("\nTo use: bd pour %s --var <name>=<value>\n", result.ProtoID)
+	fmt.Printf("\nTo use: bd mol pour %s --var <name>=<value>\n", result.ProtoID)
 }
 
 // cookFormulaResult holds the result of cooking
@@ -356,6 +365,8 @@ type cookFormulaResult struct {
 // cookFormulaToSubgraph creates an in-memory TemplateSubgraph from a resolved formula.
 // This is the ephemeral proto implementation - no database storage.
 // The returned subgraph can be passed directly to cloneSubgraph for instantiation.
+//
+//nolint:unparam // error return kept for API consistency with future error handling
 func cookFormulaToSubgraph(f *formula.Formula, protoID string) (*TemplateSubgraph, error) {
 	// Map step ID -> created issue
 	issueMap := make(map[string]*types.Issue)
@@ -586,6 +597,13 @@ func resolveAndCookFormula(formulaName string, searchPaths []string) (*TemplateS
 		resolved.Steps = formula.ApplyAdvice(resolved.Steps, resolved.Advice)
 	}
 
+	// Apply inline step expansions (gt-8tmz.35)
+	inlineExpandedSteps, err := formula.ApplyInlineExpansions(resolved.Steps, parser)
+	if err != nil {
+		return nil, fmt.Errorf("applying inline expansions to %q: %w", formulaName, err)
+	}
+	resolved.Steps = inlineExpandedSteps
+
 	// Apply expansion operators (gt-8tmz.3)
 	if resolved.Compose != nil && (len(resolved.Compose.Expand) > 0 || len(resolved.Compose.Map) > 0) {
 		expandedSteps, err := formula.ApplyExpansions(resolved.Steps, resolved.Compose, parser)