Module version

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Schema version for the LayoutTreeIR.

Field additions to existing structs in crate::ir bump SCHEMA_VERSION by one and append a migration line below.
Field removals or semantic-changing renames are breaking and require either a new major (e.g. v2) on top of v1 with a translation shim, or coordinated update of every consumer in the same PR. M1 ships v1; anything past v1 must justify the bump in this file’s migration log.
Snapshots committed under tests/ir_snapshots/ carry the version they were captured under via the schema_version field at the root of the JSON. Tests that load older snapshots must reject mismatched versions explicitly rather than silently re-interpret.

v1 (M1) — initial schema. Fields: schema_version, root with children, field_kind, form_node_id, id, kind, overflow, page_index, presence, rect, som, value_hash.

Constants§