Release v0.23.0

[halfline]

Highlights

• rewrite scan now accepts an --onto option, mirroring git rebase --onto.
  It lets you supply an older frozen base separately from the movable-base
  argument, so dependency analysis and a plan's split/reorder/donor freedom
  scope to a movable suffix of history instead of the whole snapshotted
  range. Commits in the pinned prefix may only be kept, reworded, or receive
  units through INTEGRATE.
• Added rewrite lint, an offline advisory pass that checks a rewrite plan's
  operation shape, conservation, ordering, dependencies, and unsupported
  resolutions without reading the repository. apply, resolve, and
  validate now run the same static preflight before repository-dependent
  work, and validate reports snapshot-cache hits, misses, rejections, and
  bypasses in both human and porcelain output.

Fixes

• Fixup replay now replays patches from their target trees and reuses exact
  trees during prefix replay, avoiding unnecessary diffing.
• Fixup replay preserves coordinates and additions across target groups
  instead of losing them.
• include --line now handles a moved line correctly when it is included
  before the line it was moved in front of is replaced.
• Merge now expects proof of exact-source ownership before accepting a
  satisfied source for placement.

Performance

• Mapped spill files no longer allocate a Python heap buffer, reducing memory
  use for large spills.

Documentation and translations

• The command guide and installed manual describe the new rewrite scan --onto option and rewrite lint command.
• All maintained translation catalogs (14 languages) include the new
  command-line help, error messages, and lint reporting strings.