Add governance/maintainers doc and a contributor-recognition process

[nojibe]

Problem

CONTRIBUTORS.md contains a single name and there's no documented governance: who the maintainers are, how decisions get made, how someone becomes a maintainer, and how the public blueprint repository is curated. For a project explicitly aiming to be "community-driven," this is a notable maturity gap.

Proposed change

• Add a GOVERNANCE.md (or a Governance section in a MAINTAINERS.md) describing: current maintainers, decision-making model, how to escalate, and release/curation responsibilities
• Establish a lightweight, repeatable way to keep CONTRIBUTORS.md current (e.g. all-contributors bot, or a documented manual policy)
• Clarify how community-submitted blueprints are reviewed and accepted (ties into the blueprint-proposal issue template)

Acceptance criteria

• Governance/maintainers doc exists and lists real maintainers
• Contributor-recognition process is documented and reproducible
• Blueprint curation/review process is written down