docs: add Maintainer Retainer Program (MRP) section

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website/docs/maintainer-retainer/maintainer-retainer.md

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+---
+sidebar_position: 1
+title: Maintainer Retainer Program (MRP)
+---
+
+Here’s a quick overview of the **Maintainer Retainer Program (MRP)** and the two kinds of maintainers it involves. For the full picture (eligibility, funding, reviews), check the [official OSC MRP page](https://committees.docs.intersectmbo.org/intersect-open-source-committee/about/paid-open-source-model-posm/maintainer-retainer).
+
+### What is the MRP?
+
+The MRP provides **recurring funding** to experienced contributors who maintain **critical Cardano open-source repositories**, so those projects stay secure, regularly updated, and actively developed. [Intersect](https://www.intersectmbo.org/) runs the program with the Open Source Committee (OSC) and Technical Steering Committee (TSC).
+
+### Core vs Community Maintainers
+
+**Core Maintainers** are senior project stewards with **final technical authority** over a repo's direction. They own strategic decisions, governance and policy work, release sign-off, and security-sensitive changes; they mentor others and ensure long-term project health. Think of them as the people who lead and make the big calls.
+
+**Community Maintainers** are **Trusted Committers** (in an eligible project) who join the program via application to expand capacity around a project. They focus on day-to-day maintenance, user-feedback loops, and community operations (code, docs, triage, talking to users) without holding ultimate decision rights or high-risk credentials. They must meet the [Contribution Ladder](https://committees.docs.intersectmbo.org/intersect-open-source-committee/policies/contribution-ladder-framework) threshold (≥ Trusted Committer) and pass the program's **30-day evaluation** before ongoing funding. Your contributions can be coding, documentation, governance, or ecosystem advocacy; it’s not only about code.
+
+:::info
+**Applications for Community Projects to be maintained are open!** [Apply here](https://tinyurl.com/MRP-Projects)
+:::
+
+:::info
+**Applications are open for Developers → Community Maintainers!** [Apply here](https://tinyurl.com/MRP-Apply)
+:::
+
+---
+
+### One-paragraph style
+
+The **Maintainer Retainer Program (MRP)** provides recurring funding to experienced contributors who maintain critical Cardano open-source repositories. [Intersect](https://www.intersectmbo.org/) runs it with the Open Source Committee (OSC) and Technical Steering Committee (TSC). **Core Maintainers** have final technical authority over a repo and own strategy, releases, and security; **Community Maintainers** are Trusted Committers who join via application to support day-to-day maintenance (code, docs, governance, or ecosystem advocacy) and must pass a 30-day evaluation. Full details: [Maintainer Retainer (OSC)](https://committees.docs.intersectmbo.org/intersect-open-source-committee/about/paid-open-source-model-posm/maintainer-retainer).
+
+---
+
+### Two-paragraph style
+
+The **Maintainer Retainer Program (MRP)** provides recurring funding to experienced contributors who maintain critical Cardano open-source repositories, keeping them secure and actively developed. [Intersect](https://www.intersectmbo.org/) runs the program with the Open Source Committee (OSC) and Technical Steering Committee (TSC).
+
+**Core Maintainers** lead the project with final technical authority; **Community Maintainers** join via application as Trusted Committers to support day-to-day work (code, docs, governance, or ecosystem advocacy) and must pass a 30-day evaluation. For full details, see the [official OSC page](https://committees.docs.intersectmbo.org/intersect-open-source-committee/about/paid-open-source-model-posm/maintainer-retainer).
+