Compare the native Inspect a file page with the immutable concept's
#metadata at 1600x1100 and 390x844 in both themes (initial, selected,
viewer-open), mapping D60-D66 and pinning the concept's CSS values and
the chooser's displayed file name, with a mutation check. Send a local
PNG (explicitly empty negative) and core-tags.webm to a real Prompt
Manager (+/-) node across Classic and Nodes 2.0 switches and reloads;
a connected input rejects the send unchanged. Document D60-D66, the
legacy-floor dispositions and the commands in TESTING.md.
Vito Sansevero
27ea042018