chore(architecture): enforce layer boundaries

input/AGENTS.md

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+# Input Rules
+
+- `input/` resolves keyboard, pointer, mouse, touch, pen, and wheel input only.
+- Resolution order is strict: global consumer first, command fallback second.
+- If the global consumer handles input, stop and do not dispatch a command.
+- Input handlers must never mutate state directly.
+- Input may dispatch commands by id with payloads.
+- Keep this layer independent from React, renderer, editor store internals, and persisted core domain models.
+- DOM/browser events should be normalized into small input event types before command mapping.