finalize-worktreelisted

Finalize a session: verify it is clean and mergeable, land it on `main` through exactly one merge-commit PR, fast-forward the local `main` ref from `origin/main`, then delete the branch (and, if the session ran in a worktree, remove the worktree). Handles both shapes a session can take under `.claude/rules/workflow.md`: an isolated `feature/*` worktree, or a `feature/*` branch checked out in the primary tree with no worktree. It never merges locally. It pushes the session branch itself with a normal, non-force push; the one human checkpoint is an explicit confirmation before the PR is merged. Everything else goes through `gh`. The fix for the local-vs-`origin/main` divergence (ISS-W3) is the never-merge-locally discipline, independent of remote merge strategy: local `main` only ever fast-forwards from `origin/main` after the remote merge, so it cannot diverge from the GitHub result. The PR is merged with `--merge` (a merge commit), which keeps the merged branch tip a real ancestor of `origin/main` so the local branch deletes with a self-verifying `git branch -d`, never a forced `-D`. ## Project configuration The manifest is this skill's configuration. If `$(git rev-parse --show-toplevel)/.claude/lifecycle-manifest.md` does not exist, the project has not adopted the kit: say so, offer to create it, and stop. Never infer the keys and run anyway. The kit ships the template as `lifecycle-manifest.template.md`; locate the installed copy with `find ~/.claude/plugins -path '*life