Delta pull for native clients: returns every note + label the caller owns whose sync_revision advanced past ?since=<cursor>, ascending by revision, paginated (?limit, default 500 / max 1000), with the next cursor + has_more. since=0 is a full initial sync. Web app unaffected (new blueprint). Notes and labels share one revision sequence, so the cursor is a single watermark. _page_cursor() handles the two-stream paging: when either stream fills its page, it advances only to the SMALLER of the two page boundaries so nothing between the cursor and the next pull is skipped. Notes reuse _serialize_notes (items/labels/attachments inline) + sync_revision + purged_at (tombstone); labels carry name/color/purged_at/sync_revision. Returns ALL of the owner's notes regardless of state (active/archived/ trash/purged) — a client mirrors everything. Registered sync blueprint. Tests (DB-free): changes auth-guard; _parse_since / _clamp_limit validation; _page_cursor across empty / drained / one-full / both-full. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm