codemap 0.0.6 — checks that had never been shown the thing they must reject

Evidence rather than behaviour: one new item (a warm server that says when it is
running code the installed distribution has moved past) and three that change what
is known about the tool rather than what it does — every contract rule
mutation-tested on a real tree, the target guard's decision tested directly, and a
defect measured on a flat layout where it merged two trees rather than replacing
one.

Schema 0.13, unchanged; no rebuild needed. Published as codmap 0.0.6.

Superseded within the day by 0.0.7: the new diagnostic could not fire as shipped.