fix(sqlite): add missing agent fields to scanIssues and related queries (#1176)

The scanIssues() function and multiple SQL queries were not selecting or
scanning agent-related fields (hook_bead, role_bead, agent_state, last_activity,
role_type, rig, mol_type) and time-based scheduling fields (due_at, defer_until).

This caused bd list --json to return null for last_activity even when the
database contained valid timestamps, preventing proper agent health monitoring.

Updated files:
- dependencies.go: scanIssues() variable declarations, scan calls, assignments
- queries.go: SearchIssues query
- labels.go: GetIssuesByLabel query
- ready.go: GetReadyWork and GetNewlyUnblockedByClose queries
- transaction.go: GetIssue query, SearchIssues query, scanIssueRow()

Fixes steveyegge/beads#1175

internal/storage/sqlite/transaction.go

@@ -332,7 +332,9 @@ func (t *sqliteTxStorage) GetIssue(ctx context.Context, id string) (*types.Issue
 		       compaction_level, compacted_at, compacted_at_commit, original_size, source_repo, close_reason,
 		       deleted_at, deleted_by, delete_reason, original_type,
 		       sender, ephemeral, pinned, is_template, crystallizes,
-		       await_type, await_id, timeout_ns, waiters
+		       await_type, await_id, timeout_ns, waiters,
+		       hook_bead, role_bead, agent_state, last_activity, role_type, rig, mol_type,
+		       due_at, defer_until
 		FROM issues
 		WHERE id = ?
 	`, id)
@@ -1261,7 +1263,9 @@ func (t *sqliteTxStorage) SearchIssues(ctx context.Context, query string, filter
 		       compaction_level, compacted_at, compacted_at_commit, original_size, source_repo, close_reason,
 		       deleted_at, deleted_by, delete_reason, original_type,
 		       sender, ephemeral, pinned, is_template, crystallizes,
-		       await_type, await_id, timeout_ns, waiters
+		       await_type, await_id, timeout_ns, waiters,
+		       hook_bead, role_bead, agent_state, last_activity, role_type, rig, mol_type,
+		       due_at, defer_until
 		FROM issues
 		%s
 		ORDER BY priority ASC, created_at DESC
@@ -1316,6 +1320,17 @@ func scanIssueRow(row scanner) (*types.Issue, error) {
 	var awaitID sql.NullString
 	var timeoutNs sql.NullInt64
 	var waiters sql.NullString
+	// Agent fields
+	var hookBead sql.NullString
+	var roleBead sql.NullString
+	var agentState sql.NullString
+	var lastActivity sql.NullTime
+	var roleType sql.NullString
+	var rig sql.NullString
+	var molType sql.NullString
+	// Time-based scheduling fields
+	var dueAt sql.NullTime
+	var deferUntil sql.NullTime
 
 	err := row.Scan(
 		&issue.ID, &contentHash, &issue.Title, &issue.Description, &issue.Design,
@@ -1326,6 +1341,8 @@ func scanIssueRow(row scanner) (*types.Issue, error) {
 		&deletedAt, &deletedBy, &deleteReason, &originalType,
 		&sender, &wisp, &pinned, &isTemplate, &crystallizes,
 		&awaitType, &awaitID, &timeoutNs, &waiters,
+		&hookBead, &roleBead, &agentState, &lastActivity, &roleType, &rig, &molType,
+		&dueAt, &deferUntil,
 	)
 	if err != nil {
 		return nil, fmt.Errorf("failed to scan issue: %w", err)
@@ -1407,6 +1424,35 @@ func scanIssueRow(row scanner) (*types.Issue, error) {
 	if waiters.Valid && waiters.String != "" {
 		issue.Waiters = parseJSONStringArray(waiters.String)
 	}
+	// Agent fields
+	if hookBead.Valid {
+		issue.HookBead = hookBead.String
+	}
+	if roleBead.Valid {
+		issue.RoleBead = roleBead.String
+	}
+	if agentState.Valid {
+		issue.AgentState = types.AgentState(agentState.String)
+	}
+	if lastActivity.Valid {
+		issue.LastActivity = &lastActivity.Time
+	}
+	if roleType.Valid {
+		issue.RoleType = roleType.String
+	}
+	if rig.Valid {
+		issue.Rig = rig.String
+	}
+	if molType.Valid {
+		issue.MolType = types.MolType(molType.String)
+	}
+	// Time-based scheduling fields
+	if dueAt.Valid {
+		issue.DueAt = &dueAt.Time
+	}
+	if deferUntil.Valid {
+		issue.DeferUntil = &deferUntil.Time
+	}
 
 	return &issue, nil
 }