v0.11.0 OpenAI Agents SDK example

Adds an OpenAI Agents SDK approval-gate example for routing tool invocations through aeg-intent-gate before real execution.\n\nHighlights:\n- New examples/frameworks/openai-agents-sdk-approval-gate.ts\n- Maps toolName, toolCallId, and toolArguments into gateToolCall()\n- Returns execute, requires_approval, or blocked routing decisions\n- Shows where pending approval state should live outside the SDK run\n- Adds tests for helper exports and invocation mapping\n\nPublished npm latest: @pallattu/aeg-intent-gate@0.11.0