feat: add Jarvis agent verification foundation

Add Day 1 agent runtime foundations with task and event schemas, verifier support, capability metadata, graph event tracing, and regression coverage while preserving the direct execution path.

backend/app/agents/state.py

@@ -1,7 +1,9 @@
 from dataclasses import dataclass
 from enum import Enum
-from typing import Annotated, Any, TypedDict
+from typing import Annotated, Any, Literal, TypedDict
 
+from app.agents.schemas.event import AgentEvent
+from app.agents.schemas.task import AgentTask, TaskResult, VerificationStatus
 from langchain_core.messages import BaseMessage
 from langgraph.graph.message import add_messages
 
@@ -27,6 +29,7 @@ class AgentState(TypedDict):
     user_id: str
     conversation_id: str
 
+    execution_mode: Literal["direct", "delegated", "verified"]
     current_agent: str | None
     next_step: str | None
     active_agents: list[AgentRole]
@@ -34,14 +37,24 @@ class AgentState(TypedDict):
     active_sub_commanders: list[str]
     sub_commander_trace: list[dict[str, Any]]
     agent_trace: list[str]
+    event_trace: list[AgentEvent | dict[str, Any]]
 
     pending_tasks: list[dict[str, Any]]
     completed_tasks: list[dict[str, Any]]
+    active_tasks: list[AgentTask | dict[str, Any]]
+    task_results: list[TaskResult | dict[str, Any]]
     tool_calls: list[dict[str, Any]]
     last_tool_result: str | None
     action_results: list[dict[str, Any]]
     created_entities: list[dict[str, Any]]
     tool_outcomes: list[dict[str, Any]]
+    task_result_summary: dict[str, Any] | None
+    verifier_hints: dict[str, Any] | None
+
+    verification_status: VerificationStatus | None
+    verification_summary: str | None
+    verification_evidence: list[dict[str, Any]]
+    budget_state: dict[str, Any] | None
 
     tool_strategy_used: str | None
     tool_round_count: int
@@ -89,6 +102,7 @@ def initial_state(user_id: str, conversation_id: str) -> AgentState:
         messages=[],
         user_id=user_id,
         conversation_id=conversation_id,
+        execution_mode="direct",
         current_agent=AgentRole.MASTER.value,
         next_step=None,
         active_agents=[AgentRole.MASTER],
@@ -96,13 +110,22 @@ def initial_state(user_id: str, conversation_id: str) -> AgentState:
         active_sub_commanders=[],
         sub_commander_trace=[],
         agent_trace=[AgentRole.MASTER.value],
+        event_trace=[],
         pending_tasks=[],
         completed_tasks=[],
+        active_tasks=[],
+        task_results=[],
         tool_calls=[],
         last_tool_result=None,
         action_results=[],
         created_entities=[],
         tool_outcomes=[],
+        task_result_summary=None,
+        verifier_hints=None,
+        verification_status=None,
+        verification_summary=None,
+        verification_evidence=[],
+        budget_state=None,
         tool_strategy_used=None,
         tool_round_count=0,
         max_tool_rounds=2,