The sequencer and the release entrypoint each carried their own copy of
what makes an attempt outstanding, and discover still read the old
vX.Y.Z-rc claim shape. One pure predicate in versioning now answers it
for both, and the sequencer lists receipt tags, attempt refs, and
abandon markers, filtering each through its parser. An attempt is
burned by its marker, published by its final tag, and green only with
its draft and a succeeded workflow; more than one outstanding attempt
across all versions is refused.
A version is now spent only by publication. derive_next_version reads the
published stable head alone, and release claims the next attempt of that
version as rc.<N>-vX.Y.Z. An abandon marker clears an attempt without
freeing its number.
At most one attempt, of any version, is outstanding: an attempt ref with no
marker and no final tag on the remote. release refuses while one exists and
prints its workflow run, the abandon command, and the rerun command. The
pre-check and the push are not atomic across versions, so release re-reads
the attempts after its push and stops before the draft and the dispatch if a
concurrent cut of another version landed.
A new attempt must descend from the published stable head, read from the
stable channel with its version. Abandoned attempts put no constraint on it.
Fetch refspecs are rc.* and abandoned-rc.*: a refspec may hold one '*', and
the parsers filter what the globs over-match.
An attempt ref is rc.<N>-vX.Y.Z and its abandon marker is
abandoned-rc.<N>-vX.Y.Z. The ref grammar only anchors: version_from_tag
still owns the version shape, so CalVer and canary identities stay out.
The family is the published stable head, then outstanding -rc claims, then
the seed 0.21.4 when both are empty, so the first release is 0.21.5. CalVer
tags are excluded rather than sorted: v2026.9.21 is a valid three-component
version and would win every max(). A +canary identity compares equal to its
stable; the legacy -canary prerelease still sorts before its stable so feeds
published before the migration keep their order.
