grid.js was classifier-only; make it embed ANY embeddable full-page tool the
cascade resolves as default_tool — classifier (incoming/), transmittal
(staging/), archive (the index) — as an iframe scoped to the current dir
(<dir>/<tool>.html). This is the browse-as-shell bridge from the ADR: browse
stays the top-level app and the heavy tools open in-pane (the gridView), so
navigating to staging/ or archive/ inside browse shows transmittal/archive
without leaving the shell, with ?view=browse falling back to the folder
listing (and the standalone tools still served directly at the no-slash URL).
EMBEDDABLE = {classifier, transmittal, archive}; tables/forms embed in the
preview pane instead, landing/browse don't self-embed. resolveViewMode keys
off grid.availableHere() (now generic). Validated in a containerized browser:
each dir embeds its tool, ?view=browse overrides to the listing.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
ZDDC
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