feat: Add 'hooked' status for GUPP work assignment (bd-s00m)

Separates semantics of 'pinned' (identity records) from work-on-hook:
- 'pinned' = domain table / identity record (agents, roles) - non-blocking
- 'hooked' = work on agent's hook (GUPP-driven) - blocks dependents

Changes:
- Add StatusHooked constant to types.go
- Update all blocking queries to include 'hooked' status
- Add cyan styling for 'hooked' in UI output
- Create migration 032 to convert pinned work items to hooked

Generated with Claude Code

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

internal/types/types.go

@@ -350,12 +350,13 @@ const (
 	StatusClosed     Status = "closed"
 	StatusTombstone  Status = "tombstone" // Soft-deleted issue
 	StatusPinned     Status = "pinned"    // Persistent bead that stays open indefinitely
+	StatusHooked     Status = "hooked"    // Work attached to an agent's hook (GUPP)
 )
 
 // IsValid checks if the status value is valid (built-in statuses only)
 func (s Status) IsValid() bool {
 	switch s {
-	case StatusOpen, StatusInProgress, StatusBlocked, StatusDeferred, StatusClosed, StatusTombstone, StatusPinned:
+	case StatusOpen, StatusInProgress, StatusBlocked, StatusDeferred, StatusClosed, StatusTombstone, StatusPinned, StatusHooked:
 		return true
 	}
 	return false