feat: subagent as task

[amitksingh1490]

• feat(task): add task tool for agent delegation with session resumption
• feat(task): capitalize task tool name and prevent self-delegation in task tool
• style(tests): reformat function call arguments to comply with line width limits

[graphite-app]

Critical schema bug: session_id is incorrectly listed in the required array but should be optional. The TaskInput struct defines session_id as Option<String> with #[serde(skip_serializing_if = "Option::is_none")], indicating it's optional. However, OpenAI's strict mode will reject any task tool calls that don't include this field.

Impact: All task tool invocations without session_id will fail with validation errors from OpenAI.

Fix: Remove "session_id" from the required array:

"required": [
  "agent_id",
  "tasks"
]

Suggested change

	"required": [
	"agent_id",
	"session_id",
	"tasks"
	],
	"required": [
	"agent_id",
	"tasks"
	],

Spotted by Graphite



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[amitksingh1490]

OpenAI strict mode: required field exists with all property keys

[github-actions]

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Status update or closure in 10 days.