feat(cli): add synced column support to experiment commands

Update experiment creation to track sync status:
- Insert experiments with synced=0 (not synced to server)
- Align with schema update in db.zig for offline tracking

Part of offline run synchronization feature.

cli/src/commands/experiment.zig

@@ -92,7 +92,7 @@ fn createExperiment(allocator: std.mem.Allocator, args: []const []const u8, json
         var database = try db.DB.init(allocator, db_path);
         defer database.close();
 
-        // TODO: Add synced column to schema - required for server sync
+        // Insert experiment with synced=0 (not synced to server yet)
         const sql = "INSERT INTO ml_experiments (experiment_id, name, description, status, synced) VALUES (?, ?, ?, 'active', 0);";
         const stmt = try database.prepare(sql);
         defer db.DB.finalize(stmt);