feat: add shared runtime with FastAPI job server and safety pipeline

src/models.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 from pathlib import Path
+from typing import Any
 
 
 @dataclass
@@ -21,4 +22,38 @@ class AgentResult:
     steps: int
     started_at: float
     ended_at: float
+    usage: "UsageSummary"
+    error: str | None = None
+    cancelled: bool = False
 
+
+@dataclass
+class UsageSummary:
+    input_tokens: int = 0
+    cached_input_tokens: int = 0
+    output_tokens: int = 0
+    reasoning_tokens: int = 0
+    total_tokens: int = 0
+    estimated_cost_usd: float | None = None
+    model_for_pricing: str | None = None
+
+    def to_dict(self) -> dict[str, Any]:
+        return {
+            "input_tokens": self.input_tokens,
+            "cached_input_tokens": self.cached_input_tokens,
+            "output_tokens": self.output_tokens,
+            "reasoning_tokens": self.reasoning_tokens,
+            "total_tokens": self.total_tokens,
+            "estimated_cost_usd": self.estimated_cost_usd,
+            "model_for_pricing": self.model_for_pricing,
+        }
+
+
+@dataclass
+class RuntimeOptions:
+    model: str
+    max_steps: int = 60
+    command_timeout: int = 45
+    type_interval: float = 0.02
+    click_pause: float = 0.10
+    disable_tools: set[str] | None = None