chore: add AGENTS.md with proposal creation guidance

AGENTS.md

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+<!--
+SPDX-FileCopyrightText: 2026 James Harton
+
+SPDX-License-Identifier: Apache-2.0
+-->
+
+# AGENTS.md
+
+This file provides guidance to AI coding agents when working with this repository.
+
+## Project Overview
+
+This repository contains feature proposals for the [Beam Bots](https://github.com/beam-bots/bb) robotics framework. Proposals follow a lightweight process: draft, discuss via PR, merge when ready to implement.
+
+## Creating a New Proposal
+
+### 1. Determine the Next Proposal Number
+
+**IMPORTANT:** Before creating a proposal, you MUST check both merged and open PRs to find the next available number:
+
+```bash
+gh pr list --repo beam-bots/proposals --state all --json number,title,state
+```
+
+The next proposal number is one higher than the highest existing proposal number (including open PRs, not just merged ones).
+
+### 2. Create the Proposal File
+
+1. Copy `template.md` to `accepted/NNNN-feature-name.md`
+2. Add the SPDX license header at the top:
+   ```markdown
+   <!--
+   SPDX-FileCopyrightText: 2026 James Harton
+
+   SPDX-License-Identifier: Apache-2.0
+   -->
+   ```
+3. Fill in all sections of the template
+4. Use the current date (check with `date +%Y-%m-%d`)
+
+### 3. Proposal Structure
+
+Proposals should include:
+
+- **Summary** — One paragraph explaining what this is
+- **Motivation** — Why are we doing this? What problem does it solve?
+- **Design** — How does it work? Core abstractions, modules, code examples
+- **Package Structure** — Directory layout and dependencies
+- **User Experience** — How users will interact with it
+- **Acceptance Criteria** — Must have / Should have / Won't have
+- **Open Questions** — Things to figure out during implementation
+- **References** — Links to prior art, documentation, related projects
+
+### 4. Style Guidelines
+
+- Follow the style of existing proposals (see `accepted/` directory)
+- Include code examples showing typical usage
+- Be specific about integration points with existing BB packages
+- Clearly scope what's in vs out of scope
+- Use tables for comparisons where appropriate
+
+## Common Commands
+
+```bash
+# Check REUSE license compliance
+pipx run reuse lint
+
+# List all proposals (merged and open)
+gh pr list --repo beam-bots/proposals --state all --json number,title,state
+
+# Create a PR for a new proposal
+gh pr create --title "Proposal NNNN: feature-name" --body "Description of the proposal"
+```
+
+## Directory Structure
+
+```
+proposals/
+├── accepted/     # Proposals merged and approved for implementation
+├── implemented/  # Proposals that have shipped
+├── rejected/     # Proposals we decided against (with explanation)
+├── template.md   # Proposal template
+└── README.md     # Overview and proposal index
+```
+
+## REUSE Compliance
+
+All files must have SPDX license headers. For markdown files, use HTML comments at the top of the file. For files that don't support comments (like `.json`), create a companion `.license` file.

CLAUDE.md

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+AGENTS.md