102/102. PLAN's M3 row now names both corpora as the gate, because neither the
pinned crud suite nor e2e3/e2e4 can see this work: the eight operators are
barely in the pinned corpus and `$push`'s modifiers are not in it at all.
§6 records what the corpus found that was nobody's operator -- an upsert never
reporting the `_id` it generated -- and the three things left open on purpose:
`$bit`, a multi-field `$sort` key inside `$push`, and the 64-path bound on the
conflict check.
Full matrix at this commit: 247/247 unit tests in ReleaseFast and ReleaseSafe,
83/83 fuzz, operators 102/0, positional 51/0, aggregation 70/0, pinned crud
218/73/196 unmoved, e2e and crash-fuzz green.
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