feat(workspace): session-scoped Caller.Holder + ReleaseByHolder for ACP integration

internal/workspace/sqlc/worktrees.sql.go

@@ -282,6 +282,48 @@ func (q *Queries) MarkPruneWarning(ctx context.Context, id pgtype.UUID) error {
 	return err
 }
 
+const releaseWorktreesByHolder = `-- name: ReleaseWorktreesByHolder :many
+UPDATE workspace_worktrees
+SET status = 'idle',
+    active_holder = NULL,
+    acquired_at = NULL,
+    last_used_at = now(),
+    prune_warning_at = NULL
+WHERE active_holder = $1 AND status = 'active'
+RETURNING id, workspace_id, branch, path, status, active_holder, acquired_at, last_used_at, created_at, prune_warning_at
+`
+
+func (q *Queries) ReleaseWorktreesByHolder(ctx context.Context, activeHolder *string) ([]WorkspaceWorktree, error) {
+	rows, err := q.db.Query(ctx, releaseWorktreesByHolder, activeHolder)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []WorkspaceWorktree
+	for rows.Next() {
+		var i WorkspaceWorktree
+		if err := rows.Scan(
+			&i.ID,
+			&i.WorkspaceID,
+			&i.Branch,
+			&i.Path,
+			&i.Status,
+			&i.ActiveHolder,
+			&i.AcquiredAt,
+			&i.LastUsedAt,
+			&i.CreatedAt,
+			&i.PruneWarningAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const setWorktreeActive = `-- name: SetWorktreeActive :one
 UPDATE workspace_worktrees
 SET status = 'active',