fix: Address workflow template issues from code review

- Fix resolvePartialID stub to use utils.ResolvePartialID (bd-746)
- Add validation for empty wf.Tasks before accessing wf.Tasks[0] (bd-muw)
- Remove || echo fallback from update-hooks verification (bd-0w5)
- Implement ExpectExit/ExpectStdout verification fields (bd-dwh)
- Add warning when depends_on references unknown task ID (bd-aay)
- Add bd update --parent flag to change issue parent (bd-jvu)

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

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

internal/rpc/protocol.go

@@ -89,9 +89,10 @@ type UpdateArgs struct {
 	AcceptanceCriteria *string  `json:"acceptance_criteria,omitempty"`
 	Notes              *string  `json:"notes,omitempty"`
 	Assignee           *string  `json:"assignee,omitempty"`
-	ExternalRef        *string  `json:"external_ref,omitempty"` // Link to external issue trackers
+	ExternalRef        *string  `json:"external_ref,omitempty"`      // Link to external issue trackers
 	EstimatedMinutes   *int     `json:"estimated_minutes,omitempty"` // Time estimate in minutes
 	IssueType          *string  `json:"issue_type,omitempty"`        // Issue type (bug|feature|task|epic|chore)
+	Parent             *string  `json:"parent,omitempty"`            // New parent issue ID (empty string to remove parent)
 	AddLabels          []string `json:"add_labels,omitempty"`
 	RemoveLabels       []string `json:"remove_labels,omitempty"`
 	SetLabels          []string `json:"set_labels,omitempty"`