Add vega check for conventions a spec misses

Surfaces read a view that misses a convention as something else without
a word: a number label makes a list a table, a text tone disappears, a
list never shows its other columns, X_focus without a table becomes a
field, a second text input has nowhere to type. vega check MODULE names
each such place (the view or input and what the surface does instead)
and exits 1; the rules sit next to the code that reads the screen.

The checks build a spec that misses eight conventions and expect exactly
its nine findings, and none in the examples.

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