docs: add agents.md (#575)

Author: Brentlok

AGENTS.md

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+# Agent Instructions
+
+Read `CONTEXT.md` before making code changes.
+
+Follow existing project patterns. Prefer small, focused changes. Do not duplicate architecture or domain context here; keep `CONTEXT.md` as the source of truth.
+
+Before changing public APIs, build/runtime contracts, supported platforms, or architecture, update `CONTEXT.md`.
+
+## Checks
+
+Use `bun` for repo commands.
+
+Common checks:
+
+- `bun run lint`
+- `bun run check:typescript`
+- `bun run test`
+- `bun run format`
+
+For package-specific work under `packages/uniwind`, prefer targeted package scripts when available:
+
+- `bun run build`
+- `bun run check:typescript`
+- `bun run lint`
+- `bun run circular:check`
+- `bun run test:native`
+- `bun run test:web`
+- `bun run test:types`
+- `bun run test:e2e`
+
+Run relevant checks after changes when practical. Mention skipped checks in final response.

CLAUDE.md

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+AGENTS.md