MIL-115 Add A2A HITL skill loading demo

[davidmarkgardiner]

Refs MIL-115

Summary

• add an examples/a2a-human-in-the-loop kustomize demo with coordinator and specialist agents
• demonstrate A2A delegation from coordinator to specialist
• demonstrate a human approval checkpoint with the built-in ask_user HITL tool
• demonstrate runtime skill loading from https://github.com/kagent-dev/kagent.git via spec.skills.gitRefs

Validation

• kubectl kustomize examples/a2a-human-in-the-loop
• kubectl apply --dry-run=server -k examples/a2a-human-in-the-loop
• temporary live deploy with placeholder model secret: both agent/a2a-hitl-specialist and agent/a2a-hitl-coordinator reached Ready=True; demo resources and secret were deleted afterward

Note: actual chat completion still requires a real OPENAI_API_KEY secret as documented in the README.

[Copilot]

Pull request overview

Adds a new kustomize-based example demonstrating A2A delegation with a human-in-the-loop checkpoint and runtime skill loading from a Git repository, intended as a runnable demo for MIL-115.

Changes:

• Introduces a new examples/a2a-human-in-the-loop kustomize demo (ModelConfig + two declarative Agents).
• Implements coordinator→specialist delegation over A2A, with the specialist pausing on ask_user approval before proceeding.
• Demonstrates dynamic skill loading via spec.skills.gitRefs and running the loaded skill via the skills + bash tools.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
examples/a2a-human-in-the-loop/README.md	Deployment/run/cleanup instructions for the A2A + HITL + git skill loading demo.
examples/a2a-human-in-the-loop/modelconfig.yaml	Adds an OpenAI-backed ModelConfig used by the demo agents.
examples/a2a-human-in-the-loop/kustomization.yaml	Wires the example resources together for kubectl apply -k.
examples/a2a-human-in-the-loop/agents.yaml	Defines the coordinator and specialist agents, including A2A config and git skill loading.

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