docs(backlog): file item 167, no build identity between releases

The reconciliation against the user's own notes found one entry with no
item here: a dev build number, so a rebuilt binary can be told from the
one it replaced. Verified in the code rather than copied from the note.
`src/version.h.in` interpolates PROJECT_VERSION alone, which moves only
when the release procedure bumps it, and the user hand-tests unreleased
builds daily.

It needs a decision before any code. A git description is accurate and
costs a configure-time dependency that is easy to ship wrong; a counter
always moves and identifies nothing. Either way a release build must
keep printing a clean X.Y.Z, since the SlackBuild builds from a tarball
with no git checkout.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HFuRPtzFrSxCQjFk6tq7gD

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