Four polish fixes

1. get shows milestones/labels: GetCommand._format() now shows Milestones:/Labels:
   lines when non-empty, between Created: and Links:

2. unarchive command: kanban unarchive --id <id> [--column <col>] restores a
   ticket from archive/ back to a column (default: first configured column);
   registered as 'kanban_unarchive_ticket' MCP tool (15 tools total)

3. Test isolation: add dart_test.yaml (concurrency: 1) — Directory.current is
   a process-global OS chdir(); concurrent test files in the same process
   would race. Now dart test packages/core packages/kanban passes cleanly.

4. update empty multi-option fix: --milestone '' / --label '' with empty
   strings now filters them out (treats as 'clear to empty') rather than
   writing spurious empty-string YAML list entries

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

dart_test.yaml

@@ -0,0 +1,4 @@
+# Tests that mutate Directory.current (a process-global OS call) must not run
+# concurrently across test files in the same process — the last chdir() wins
+# and can leave other suites pointing at a deleted temp directory.
+concurrency: 1

packages/core/lib/src/config.dart

@@ -23,9 +23,10 @@ class ProjectContext {
 
   const ProjectContext({required this.root, required this.config});
 
-  /// Walks up from [Directory.current] until a `.project/dew.yaml` is found.
-  static Future<ProjectContext> find() async {
-    var dir = Directory.current;
+  /// Walks up from [from] (defaults to [Directory.current]) until a
+  /// `.project/dew.yaml` is found.
+  static Future<ProjectContext> find({Directory? from}) async {
+    var dir = from ?? Directory.current;
     while (true) {
       final configFile = File(p.join(dir.path, '.project', 'dew.yaml'));
       if (await configFile.exists()) {

packages/kanban/lib/src/commands/get_command.dart

@@ -41,6 +41,12 @@ class GetCommand extends DewCommand with DewToolCommand {
     final buf = StringBuffer();
     buf.writeln('[${t.id}] (${t.type}) [${t.column}] ${t.title}');
     buf.writeln('Created: ${t.created.toLocal().toString().split('.').first}');
+    if (t.milestones.isNotEmpty) {
+      buf.writeln('Milestones: ${t.milestones.join(', ')}');
+    }
+    if (t.labels.isNotEmpty) {
+      buf.writeln('Labels: ${t.labels.join(', ')}');
+    }
     if (t.links.isNotEmpty) {
       buf.writeln();
       buf.writeln('Links:');

packages/kanban/lib/src/commands/unarchive_command.dart

@@ -0,0 +1,60 @@
+import 'dart:io';
+
+import 'package:dew_core/dew_core.dart';
+import '../kanban_config.dart';
+import 'package:path/path.dart' as p;
+
+import '../ticket_store.dart';
+
+class UnarchiveCommand extends DewCommand with DewToolCommand {
+  UnarchiveCommand() {
+    argParser
+      ..addOption('id', abbr: 'i', mandatory: true, help: 'Ticket ID to unarchive.')
+      ..addOption(
+        'column',
+        abbr: 'c',
+        help: 'Column to restore to. Defaults to the first configured column.',
+      );
+  }
+
+  @override
+  final String name = 'unarchive';
+
+  @override
+  final String description = 'Restore an archived ticket to a column.';
+
+  @override
+  final String toolName = 'kanban_unarchive_ticket';
+
+  @override
+  Future<String> callAsTool(Map<String, dynamic> args) async {
+    final id = (args['id'] as String).toUpperCase();
+
+    final context = await ProjectContext.find();
+    final config = context.config.kanban;
+    final kanbanDir = p.join(context.root, '.project', 'kanban');
+
+    final store = TicketStore(kanbanDir: kanbanDir, prefix: config.prefix);
+    final ticket = await store.findById(id);
+    if (ticket == null) throw ArgumentError('Ticket $id not found.');
+    if (ticket.column != 'archive') return '$id is not archived.';
+
+    final columnArg = args['column'] as String?;
+    final targetColumn = columnArg ?? config.columns.first.id;
+    if (!config.columns.any((c) => c.id == targetColumn)) {
+      throw ArgumentError(
+        'Unknown column "$targetColumn". '
+        'Valid: ${config.columns.map((c) => c.id).join(', ')}',
+      );
+    }
+
+    final targetDir = Directory(p.join(kanbanDir, targetColumn));
+    await targetDir.create(recursive: true);
+
+    final srcFile = File(p.join(kanbanDir, 'archive', '$id.md'));
+    final dstFile = File(p.join(targetDir.path, '$id.md'));
+    await srcFile.rename(dstFile.path);
+
+    return 'Restored $id to "$targetColumn".';
+  }
+}

packages/kanban/lib/src/commands/update_command.dart

@@ -40,11 +40,12 @@ class UpdateCommand extends DewCommand with DewToolCommand {
     final body = args['body'] as String?;
     final rawMilestones = args['milestone'] as List?;
     final milestones = rawMilestones != null && rawMilestones.isNotEmpty
-        ? rawMilestones.cast<String>()
+        ? rawMilestones.cast<String>().where((s) => s.isNotEmpty).toList()
         : null;
     final rawLabels = args['label'] as List?;
-    final labels =
-        rawLabels != null && rawLabels.isNotEmpty ? rawLabels.cast<String>() : null;
+    final labels = rawLabels != null && rawLabels.isNotEmpty
+        ? rawLabels.cast<String>().where((s) => s.isNotEmpty).toList()
+        : null;
 
     if (title == null &&
         typeId == null &&

packages/kanban/lib/src/dew_kanban_base.dart

@@ -12,6 +12,7 @@ import 'commands/list_command.dart';
 import 'commands/move_command.dart';
 import 'commands/search_command.dart';
 import 'commands/stats_command.dart';
+import 'commands/unarchive_command.dart';
 import 'commands/unlink_command.dart';
 import 'commands/update_command.dart';
 
@@ -25,6 +26,7 @@ class KanbanCommand extends DewCommand {
     addSubcommand(UpdateCommand());
     addSubcommand(DeleteCommand());
     addSubcommand(ArchiveCommand());
+    addSubcommand(UnarchiveCommand());
     addSubcommand(MoveCommand());
     addSubcommand(SearchCommand());
     addSubcommand(AddCommentCommand());

packages/kanban/test/dew_kanban_test.dart

@@ -18,7 +18,7 @@ void main() {
       expect(
         cmd.subcommands.keys,
         containsAll([
-          'create', 'list', 'board', 'get', 'update', 'delete', 'archive',
+          'create', 'list', 'board', 'get', 'update', 'delete', 'archive', 'unarchive',
           'move', 'search', 'comment', 'config', 'stats', 'link', 'unlink',
         ]),
       );
@@ -36,7 +36,7 @@ void main() {
       final registry = CommandRegistry();
       registerCommands(registry);
       final tools = registry.mcpTools;
-      expect(tools, hasLength(14));
+      expect(tools, hasLength(15));
       final names = tools.map((t) => t.name).toSet();
       expect(names, {
         'kanban_create_ticket',
@@ -46,6 +46,7 @@ void main() {
         'kanban_update_ticket',
         'kanban_delete_ticket',
         'kanban_archive_ticket',
+        'kanban_unarchive_ticket',
         'kanban_move_ticket',
         'kanban_search_tickets',
         'kanban_add_comment',