feat(sisyphus): add foundation schemas for tasks and swarm (Wave 1)

- Add SisyphusTasksConfig and SisyphusSwarmConfig to schema.ts
- Create Task JSON schema with Zod validation
- Create Mailbox IPC protocol message schemas
- Add storage utilities with Claude Code path compatibility
- 25 tests passing

assets/oh-my-opencode.schema.json

@@ -2808,6 +2808,50 @@
           "minimum": 20
         }
       }
+    },
+    "sisyphus": {
+      "type": "object",
+      "properties": {
+        "tasks": {
+          "type": "object",
+          "properties": {
+            "enabled": {
+              "default": false,
+              "type": "boolean"
+            },
+            "storage_path": {
+              "default": ".sisyphus/tasks",
+              "type": "string"
+            },
+            "claude_code_compat": {
+              "default": false,
+              "type": "boolean"
+            }
+          }
+        },
+        "swarm": {
+          "type": "object",
+          "properties": {
+            "enabled": {
+              "default": false,
+              "type": "boolean"
+            },
+            "storage_path": {
+              "default": ".sisyphus/teams",
+              "type": "string"
+            },
+            "ui_mode": {
+              "default": "toast",
+              "type": "string",
+              "enum": [
+                "toast",
+                "tmux",
+                "both"
+              ]
+            }
+          }
+        }
+      }
     }
   }
 }