feat(programmer): day sheet providers + controller

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/models/programmer_day_sheet.model.dart

@@ -37,6 +37,9 @@ class DaySheetSnapshot {
         'rows': rows.map((r) => r.toJson()).toList(),
       };
 
+  /// Alias for [toJson]; used by the approval RPC payload.
+  Map<String, dynamic> toMap() => toJson();
+
   factory DaySheetSnapshot.fromJson(Map<String, dynamic> j) {
     final rowsList = (j['rows'] as List? ?? [])
         .map((r) => DaySheetRow.fromJson(r as Map<String, dynamic>))

lib/models/programmer_day_sheet_event.model.dart

@@ -0,0 +1,32 @@
+/// A single audit-trail event on a programmer day sheet.
+class ProgrammerDaySheetEvent {
+  final String id;
+  final String sheetId;
+  final String kind;
+  final String? actorId;
+  final String? body;
+  final List<String> flaggedTaskIds;
+  final DateTime createdAt;
+
+  const ProgrammerDaySheetEvent({
+    required this.id,
+    required this.sheetId,
+    required this.kind,
+    this.actorId,
+    this.body,
+    required this.flaggedTaskIds,
+    required this.createdAt,
+  });
+
+  factory ProgrammerDaySheetEvent.fromMap(Map<String, dynamic> m) {
+    return ProgrammerDaySheetEvent(
+      id: m['id'] as String,
+      sheetId: m['sheet_id'] as String,
+      kind: m['kind'] as String,
+      actorId: m['actor_id'] as String?,
+      body: m['body'] as String?,
+      flaggedTaskIds: List<String>.from(m['flagged_task_ids'] as List? ?? []),
+      createdAt: DateTime.parse(m['created_at'] as String),
+    );
+  }
+}