- deriveDeterministicSubjectSummary now picks the lowest-numbered
`complete Step N` headline (or the oldest commit) instead of the most
recent commit, so trailing quality-gate revisions stop hijacking the
squash-merge subject (FN-3617 landed as "align mailbox modal css..."
when 4 of 5 commits were the actual Claude OAuth fix).
- AI subject + body system prompts in ai-summarize.ts now weight by
commit theme rather than file size, so a small token cleanup that
touches a large CSS file no longer dominates the summary.
- stashUnrelatedRootDirChanges adds a bounded re-snapshot loop after
the primary stash is persisted but before \`git reset --hard\`. Any
late-dirty paths (concurrent dev edits during a long merger run,
parallel merger runs racing on rootDir, late test/build artifacts)
get captured in labeled \`race-rescue-N\` stashes recoverable from
\`git stash list\`, instead of being wiped by the destructive reset.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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