docs: lock in 12 decisions from the 2026-05-11 interview + add Phase 11
OPEN_QUESTIONS.md: summary table of every decision (ramp foot, naming,
isStable fix, monster guard, plain-dicts→declareChildGetter, VGC→
ChildRouter, LatestWinsGate fireAndWait, drop mAbs, per-listener fan-out,
commandRegistry 'none' + description, UnitPolicy dual-shape, Phase 10
test rewrites).
TASKS.md §Phase 11: unit-aware commands. Every numeric setter declares
units: { measure, default }. commandRegistry normalises msg.payload +
msg.unit; warns + lists accepted units for bad input; falls back to
default. New query.units topic returns the spec per node.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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