The post's job is to land the timing question and the apocalypse
reframe — Wi-Fi rationale, optimisation diversions, and generalising
reflections were overexpansion. Cut.
Long-form rationale for the "durability before delivery" framing —
why a 10-second network operation in response to a single keystroke
doesn't have to feel slow. Establishes docs/notes/ as the home for
shareable design rationale (not authoritative spec).