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M304 steps 3 and the server half of 4. The client half landed in 668f7fa; these belong in one deploy, and the protocol floor below is what enforces that. notes/checklist.py is the Python half of a grammar that now exists three times — here, core/src/local/derive.rs, and (next) frontend/src/notes/markdown.ts. That triplication is the deliberate cost: the alternative is a round trip to the server before a phone can draw a checkbox. Each copy names the other two, and each is tested against the same table of cases, including the near-misses that must stay prose: `-[ ] x`, `- []`, `- [ ]x`, a `[ ]` mid-sentence. Routes: add/update/delete items stop touching rows and rewrite note.body, all through one _rewrite_body that runs the same sequence the PATCH route runs for a body change — because it IS a body change. Revisions, #tag reconciliation, the name, and link unfurls therefore happen in one place rather than three routes each remembering to. The reorder route is gone (rule 22). Reordering a checklist is moving a line, and no client ever called it — the only reference in the tree was a test asserting the route existed. The API still returns `items`, DERIVED from the body on the way out. That is not a second source of truth and it cannot disagree with the body it came from; it keeps the web client working across the rest of this milestone and saves any consumer that only wants to draw checkboxes from carrying a parser. Export drops its separate items block, in both formats. The body already ends with those exact lines, so writing them again would double every checklist in an export and then double it again on re-import. Import still ACCEPTS items, because a Keep takeout has a list and not a blob; it folds them in before the Note is built, so display_title and _reconcile_tags both see the finished text. Protocol 3 on both sides now. A v2 client is refused rather than half-served — which matters more than I first said: _apply_note_items returned early on an absent `items` key, so an un-bumped v3 client against a v2 server would not have LOST the rows, it would have kept them and then had the migration fold them a second time. Duplicated lists rather than missing ones. The floor prevents both. Migration 0027 folds every existing row into its note's body and drops the table. It inlines its own copy of the fold on purpose — a migration has to keep producing what it produced the day it ran — and a test pins that copy against the app's until they are allowed to diverge. updated_at is deliberately untouched: a client holding an unpushed edit keeps the newer timestamp, so last-write-wins keeps its work instead of the migration silently winning. The downgrade is honest rather than faithful. It recreates an empty note_items and leaves the bodies alone, because once items are lines nothing distinguishes one this migration wrote from one somebody typed, and a downgrade that guessed would eat hand-written lists. Recreating the table is still necessary: 0015's downgrade drops a trigger ON note_items, and IF EXISTS covers the trigger, not the table.