An expanded card now marks a draft ready for review and merges a change
request that the host would merge now:
- The forge seam gains provider actions `markReady` and `merge`, which
return a typed `ForgeActionFailure`; the registry polls a watched change
request at once after either settles. Snapshots carry `mergeReady` and
the `mergeMethods` the repository allows, the user's usual one first.
- GitHub marks ready with `gh pr ready` and merges through the REST merge
endpoint with the head SHA the card showed, so new commits refuse the
merge; it never enables auto-merge, joins a merge queue, or deletes the
head branch.
- The panel Remote acts only on visible bindings of the Session, and the
card offers 标记为可评审 for drafts and a 合并 menu with the allowed
methods and a confirmation, reporting each outcome in a toast.
- The forge panel e2e replaces the worktree branch before the ARIA
capture normalizes durations, so a random suffix no longer breaks it.