ds-review-bot round: the backstop stopped at a file's first declare-module
block while the projection it guards reads them all; the textual prefilter
matched only single quotes; .tsx sources escaped the glob. All three are the
silent-vanish class the scan exists to prevent. contextMergeFiles now yields
one entry per block (quote-agnostic prefilter, ts+tsx patterns), and a third
partition direction requires everything rendered to be scan-visible, so a
future scan regression is a hard error. Spec fixture made projection-
consistent; the partially superseded 2026-07-28 regions note is rewritten to
the current mechanism and cross-linked both ways.
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.
