A by-name reference edge could not tell two definitions of one name apart:
in a Go repo that defines `file` as importRun.file (internal/files, the
canon) and as sftpRun.file (internal/replication), a mirror test calling
`m.file(` was recorded as a use of the canon.
names_canon now takes defined_at, every repo path that defines each name,
in place of the shape file's own names. The own-file rule is unchanged.
When the repo also defines the canon's name somewhere the canon is not
recorded, a mention counts only from the canon's own package: the
directory of a file location exactly, or under a directory location.
A name defined once resolves as before. Proposer version 8 -> 9, so the
next coverage refresh re-reads every row and replaces its reference edges.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>