[Feat]: [Proposal] Establish A2A Partner Program Guidelines

## A2A Protocol - Partner Program Guidelines Proposal

*Executive Summary*: This proposal outlines a new, unbiased framework for defining and onboarding partners in the A2A Cloud ecosystem. By implementing a lightweight, two-step verification process, we aim to ensure partners are actively contributing and leveraging the platform effectively, moving beyond simple logo walls to highlight real-world usage and success.

## 1. Introduction & Objectives
As the A2A project grows under the shared governance of the Linux Foundation, it is critical to have a clear definition of what constitutes an "A2A Partner." The primary objectives of this proposal are:

- *Verification*: Ensure partners are actively using A2A in an expected manner that truly helps them solve real-world problems.
- *Unbiased Governance*: Maintain a fair process where all partner applications are reviewed by the Technical Steering Committee (TSC).
- *Community Showcase*: Build a robust collection of success stories and use cases to drive ecosystem attention.

## 2. Problem Statement & Challenges
Currently, the A2A project lacks a structured partner onboarding process, leading to the following challenges:

- *Lack of Verification*: There is no standardized way to verify or showcase how companies are actually using the A2A platform in production.
- *Ecosystem Quality*: Without guidelines, there is a risk of the partner list becoming an unverified "logo wall" lacking meaningful ecosystem participation.

## 3. Proposed Solution: Two-Step Onboarding
We propose implementing a flexible, two-step requirement for all prospective A2A partners to ensure quality and community benefit, while respecting corporate privacy.

### 3.1 TSC Presentation
- Prospective partners must present their idea or use case to the A2A Technical Steering Committee (TSC).
- This demonstrates that they are an active user solving their own problems with A2A, and ensures all member companies have a voice in the consensus-driven process.

### 3.2 Public Showcase OR PR Documentation
- *Option A (Public Showcase)*: Partners provide a brief blog post or demo detailing how A2A is being used in their environment. This is highly encouraged to drive shared learnings and positive attention to the broader community.
- *Option B (PR Documentation)*: For companies that cannot reveal full operational details for privacy reasons, they can provide a high-level, sanitized summary of how A2A is helping them directly within the Pull Request (PR) they raise to join the partner program.

## 4. Alternative Solutions Considered
We evaluated a few different approaches before landing on the two-step onboarding model:

### 4.1 No Requirements (Logo Wall Only)
- *Advantages*: Lowest barrier to entry.
- *Disadvantages*: Rejected because it lacks quality control and doesn't verify actual platform usage or ecosystem contribution.

### 4.2 Strict Code-Contribution Minimums
- *Advantages*: Guarantees code-level contributions to the project.
- *Disadvantages*: Rejected because we don't want to overly restrict the partner program. We want to include end-users who are successfully deploying A2A, not just developers contributing code.

## 5. Implementation Benefits
- *Quality Assurance*: Confirms that listed partners are genuinely utilizing the A2A protocol.
- *Marketing & Visibility*: Gathering blog posts and demos provides valuable, real-world content to attract new users.
- *Flexibility*: The PR Documentation alternative ensures privacy-conscious enterprise organizations aren't excluded from the community.

## 6. Partner Definition & Onboarding Checklist
To provide clear guidance to prospective partners, the following checklist will be added to the partner onboarding documentation:

**What is an A2A Partner?**
An A2A Partner is an organization actively leveraging the A2A protocol in their environment to solve real-world problems and contributing to the ecosystem's growth through shared learnings.

**To become an A2A Partner, please complete the following:**
- [ ] **Prepare your Use Case:** Clearly define how your organization is utilizing the A2A protocol.
- [ ] **Present to the TSC:** Schedule and deliver a brief presentation of your use case to the A2A Technical Steering Committee.
- [ ] **Provide Usage Documentation:** Submit *one* of the following:
- A link to a public blog post or demo showcasing your A2A implementation.
- A sanitized, high-level summary of your usage directly within your Partner application Pull Request (PR).
- [ ] **Code of Conduct:** Agree to adhere to the project's Code of Conduct.

## 7. Implementation Plan
- Update the A2A contributor/partner guidelines to reflect the new two-step onboarding strategy and include the checklist.
- Revise the Partner Pull Request template to include a mandatory field for either a link to the public showcase or the sanitized usage summary.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct