RFC (Request for Comments) template

Canonical template for the RFC (Request for Comments) format.

# RFC-NNNN: [Proposal Title]

## Status
[Draft | Under Review | Accepted | Rejected | Withdrawn | Superseded by RFC-NNNN]

## Author(s)
[Name(s), date]

## Problem
[What is broken, missing, or needed. Why this matters now.]

## Proposed Approach
[What you are proposing. Be specific enough that a reviewer can push back on the details.]

## Alternatives Considered
[Other approaches evaluated and why they were not chosen.]

## Open Questions
[What the author is uncertain about and wants reviewer input on.]

## Consequences
[What this change costs, enables, or forecloses if accepted.]