feat: rewrite docs

spec/04-identity.md

@@ -35,7 +35,7 @@ a figure-text item with kind `figure-text` and the text hash of its text.
 | --- | --- |
 | Permanence | Once established, an ID never changes, and no other node ever takes it. |
 | Retirement | A `merge` or a `delete` retires IDs ([11](11-corrections.md)). A merge records the surviving node as the successor; a delete records none. |
-| Aliases | Legacy IDs, such as the `b-p03-text-004` block IDs Lode's extracts use today, are recorded as aliases of the node that now holds that text. |
+| Aliases | Legacy IDs, such as the `b-p03-text-004` block IDs an earlier extract format used, are recorded as aliases of the node that now holds that text. |
 | Labels | What people say, such as "Eq. 3" or "Table S1", is a `label`, never an ID. |
 | Display paths | Tools may show a path such as `§2.3 ¶4 s2`; it is never stored or cited. |