feat(cli): Ralph loop lands branches with a merge, preserving each ticket's commits

[4lgn]

What & why

The Ralph loop's landing squashed each ticket into a single commit on the shared integration base. This change keeps all of the branch's commits instead.

The loop-owned landing (ADR-0032) used git merge --squash, collapsing every finished ralph/<n>-* branch into one commit. It now lands with git merge --no-ff, so each ticket's own commits — the push-after-every-green-step history — are preserved beneath one labelled merge commit.

What changed

• The land is a non-fast-forward merge: git merge --no-ff origin/<branch> -m "<title> (#n)" -m "Closes #n" -m "Landed by the Ralph loop…". The merge commit still carries the Conventional Commit title, the (#n) reference, and the Closes #n trailer, so the ticket→commit trail and the auto-close keyword are intact; the branch's commits are reachable beneath it.
• Everything else about the landing is unchanged — the serialized lander, the fast gate on the merged tree, remote verification, checkpoints, and the baseMoved re-sync (a conflict or a gate-fail hands back as before). --no-ff has the same success/conflict surface the squash did, so throughput doesn't regress.
• Empty land: a merge that reports "Already up to date" (the branch adds nothing) is reported failed, as the empty squash was.

Trade-off

The integration base is no longer one linear commit per ticket — it carries a merge commit per ticket with the branch's commits beneath, WIP checkpoints included (which is what "keep all the commits" means). git log --first-parent gives the one-line-per-ticket view; reverting a ticket is git revert -m 1 <merge>.

The single-ticket /launch-implement PR flow is untouched — a one-ticket PR squash-merged into the default branch is a separate, conventional choice, not the loop's shared-branch landing.

Files

• packages/cli/assets/ralph.workflow.js — Land dispatch, schema descriptions, comments (+ mirrored example)
• launch-ralph / launch-ralph-implement skills — landing section, policy lines, hand-off note (+ mirrored examples)
• packages/cli/src/lib/seeds.ts — seeded loop summary (+ generated example)
• docs/adr/2026-09-17-ralph-land-preserves-commits.md — new ADR (amends ADR-0032 and ADR-0022); registry index regenerated
• packages/cli/tests/add-ralph.test.ts — asserts git merge --no-ff, no --squash

Validation

pnpm build clean · pnpm test — 256 passed · launchrail adr index regenerated and idempotent.

🤖 Generated with Claude Code

https://claude.ai/code/session_01WCjoCBSGLqPnNRQdkh2Qr5

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Generated by Claude Code

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