# description
An index chain document — an LWW-Map folded via the canonical fold. Each operation's document carries an array of set/remove deltas over content-ref keys. The resolved index is the fold over ALL operations (every branch) in canonical order; the last delta touching a key wins.

# properties.deltas.description
Ordered deltas contributed by this operation. Applied in array order within the document, then across documents in canonical fold order.

# properties.deltas.items.properties.op.description
Delta operation. 'set' and 'remove' are the v1 vocabulary; deltas with other ops are valid and are skipped deterministically by readers (forward compat). Validators MUST NOT reject documents carrying additional delta shapes.

# properties.deltas.items.allOf[].then.properties.key.description
Content ref — a 31-char content chain id or a CID.

# $defs.entry.description
Optional entry metadata for a set delta. A pure set-membership index uses the degenerate empty object {}. Unknown fields are preserved (forward compat).

# $defs.entry.properties.order.description
Optional ordering hint (integer per the content number-encoding rule).