Add instructions for coding agents

Author: ronnyroeller

AGENTS.md

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+# AGENTS.md (repo root)
+
+## Defaults (apply to every task)
+- Prefer minimal, reviewable diffs.
+- Keep changes aligned with existing patterns and conventions in this repo.
+- If you add/change business logic (not UI), also add/update tests.
+- If you change UI, update storybook accordingly.
+
+## Required checks before you finish
+Run these before marking the task done (unless explicitly told not to):
+1) Lint + typecheck
+   - `yarn lint`
+   - `yarn typecheck` (or `yarn tsc`)
+
+2) Unit tests
+   - `yarn test --watchman=false`
+
+3) Storybook (only if UI/components changed)
+   - Ensure story files are updated/added.
+   - If component API or visuals changed: add/update stories and any relevant snapshots.
+
+## When you should run what
+- Pure refactor / no behavior change: lint + typecheck only, tests if risk is non-trivial.
+- Any logic change: lint + typecheck + tests.
+- Any UI/component change: lint + typecheck + tests + story updates (and storybook tests if available).
+
+## Output expectations
+- Summarize what changed and why.
+- List the commands you ran and their result.
+- Call out any follow-ups you did NOT do (and why).