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>

internal/rpc/protocol.go

@@ -3,6 +3,8 @@ package rpc
 import (
 	"encoding/json"
 	"time"
+
+	"github.com/steveyegge/beads/internal/types"
 )
 
 // Operation constants for all bd commands
@@ -18,6 +20,7 @@ const (
 	OpCount           = "count"
 	OpShow            = "show"
 	OpReady           = "ready"
+	OpBlocked         = "blocked"
 	OpStale           = "stale"
 	OpStats           = "stats"
 	OpDepAdd          = "dep_add"
@@ -86,11 +89,12 @@ type CreateArgs struct {
 	WaitsFor     string `json:"waits_for,omitempty"`      // Spawner issue ID to wait for
 	WaitsForGate string `json:"waits_for_gate,omitempty"` // Gate type: all-children or any-children
 	// Messaging fields (bd-kwro)
-	Sender string `json:"sender,omitempty"` // Who sent this (for messages)
-	Wisp   bool   `json:"wisp,omitempty"`   // Wisp = ephemeral vapor from the Steam Engine; bulk-deleted when closed
+	Sender    string `json:"sender,omitempty"`    // Who sent this (for messages)
+	Ephemeral bool   `json:"ephemeral,omitempty"` // If true, not exported to JSONL; bulk-deleted when closed
 	RepliesTo string `json:"replies_to,omitempty"` // Issue ID for conversation threading
 	// ID generation (bd-hobo)
-	IDPrefix string `json:"id_prefix,omitempty"` // Override prefix for ID generation (mol, wisp, etc.)
+	IDPrefix  string `json:"id_prefix,omitempty"`  // Override prefix for ID generation (mol, eph, etc.)
+	CreatedBy string `json:"created_by,omitempty"` // Who created the issue
 }
 
 // UpdateArgs represents arguments for the update operation
@@ -111,8 +115,8 @@ type UpdateArgs struct {
 	RemoveLabels       []string `json:"remove_labels,omitempty"`
 	SetLabels          []string `json:"set_labels,omitempty"`
 	// Messaging fields (bd-kwro)
-	Sender *string `json:"sender,omitempty"` // Who sent this (for messages)
-	Wisp   *bool   `json:"wisp,omitempty"`   // Wisp = ephemeral vapor from the Steam Engine; bulk-deleted when closed
+	Sender    *string `json:"sender,omitempty"`    // Who sent this (for messages)
+	Ephemeral *bool   `json:"ephemeral,omitempty"` // If true, not exported to JSONL; bulk-deleted when closed
 	RepliesTo *string `json:"replies_to,omitempty"` // Issue ID for conversation threading
 	// Graph link fields (bd-fu83)
 	RelatesTo    *string `json:"relates_to,omitempty"`    // JSON array of related issue IDs
@@ -124,8 +128,16 @@ type UpdateArgs struct {
 
 // CloseArgs represents arguments for the close operation
 type CloseArgs struct {
-	ID     string `json:"id"`
-	Reason string `json:"reason,omitempty"`
+	ID          string `json:"id"`
+	Reason      string `json:"reason,omitempty"`
+	SuggestNext bool   `json:"suggest_next,omitempty"` // Return newly unblocked issues (GH#679)
+}
+
+// CloseResult is returned when SuggestNext is true (GH#679)
+// When SuggestNext is false, just the closed issue is returned for backward compatibility
+type CloseResult struct {
+	Closed    *types.Issue   `json:"closed"`              // The issue that was closed
+	Unblocked []*types.Issue `json:"unblocked,omitempty"` // Issues newly unblocked by closing
 }
 
 // DeleteArgs represents arguments for the delete operation
@@ -181,8 +193,8 @@ type ListArgs struct {
 	// Parent filtering (bd-yqhh)
 	ParentID string `json:"parent_id,omitempty"`
 
-	// Wisp filtering (bd-bkul)
-	Wisp *bool `json:"wisp,omitempty"`
+	// Ephemeral filtering (bd-bkul)
+	Ephemeral *bool `json:"ephemeral,omitempty"`
 }
 
 // CountArgs represents arguments for the count operation
@@ -243,6 +255,12 @@ type ReadyArgs struct {
 	SortPolicy string   `json:"sort_policy,omitempty"`
 	Labels     []string `json:"labels,omitempty"`
 	LabelsAny  []string `json:"labels_any,omitempty"`
+	ParentID   string   `json:"parent_id,omitempty"` // Filter to descendants of this bead/epic
+}
+
+// BlockedArgs represents arguments for the blocked operation
+type BlockedArgs struct {
+	ParentID string `json:"parent_id,omitempty"` // Filter to descendants of this bead/epic
 }
 
 // StaleArgs represents arguments for the stale command