The rendering projection walks only files reachable from host-face package
exports, so client-face Events merges vanished silently (12 events) and the
services backstop's top-level glob missed 13 nested client Context keys.
Events now get the exact mirror of the service backstop (EVENT_WALK_EXEMPTIONS,
name-keyed because client events share scopes with rendered host events), both
scans read packages/*/*/src/**/*.ts, and the partition judgment is the pure
walkPartitionProblems() so every acceptance path is unit-provable.
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