docs: withdraw the ZeroClaw integration claims

CLAUDE.md said ZeroClaw "imports this as a Cargo feature (clawhdf5
feature flag)" and uses clawhdf5 as its memory backend; the agent crate
called itself the "ZeroClaw agent memory HDF5 backend"; the migrator
claimed to read "the ZeroClaw layout". Checked on 2026-09-25 against
ZeroClaw v0.8.5 (its latest release), the osobh/zeroclaw fork (on
v0.8.5) and both histories back to February 2026:

- no `clawhdf5` feature, dependency or memory backend has ever existed
  in ZeroClaw; its backends are sqlite, lucid, postgres, qdrant,
  markdown and none, behind its own `Memory` trait;
- ZeroClaw's SQLite schema is a single `memories` table (id, key,
  content, category, embedding, created_at, updated_at); the
  migrator's memory_chunks/sessions/entities/relations layout never
  existed in ZeroClaw, so it cannot read a ZeroClaw database.

Decision: withdraw the claims (as with OpenClaw); clawhdf5 is a
standalone library with no framework integration. The migrator's
default layout is documented as its own. ZEROCLAW_VERSION keeps its name
and value (it is the persisted `edgehdf5_version` writer tag) with a
doc comment saying it is unrelated to ZeroClaw.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

crates/clawhdf5-migrate/src/sqlite_reader.rs

@@ -43,7 +43,7 @@ pub struct Relation {
     pub timestamp: f64,
 }
 
-/// All data read from a ZeroClaw SQLite database.
+/// All data read from a source SQLite database.
 #[derive(Debug)]
 pub struct SqliteData {
     pub chunks: Vec<MemoryChunk>,
@@ -63,7 +63,9 @@ pub struct TableSchema {
 
 /// Configurable mapping from a SQLite layout to the migration's data model.
 ///
-/// Defaults to the ZeroClaw schema; the CLI can override the table names so the
+/// Defaults to the `memory_chunks` / `sessions` / `entities` / `relations`
+/// layout (not ZeroClaw's schema, despite what earlier docs said); the CLI can
+/// override the table names so the
 /// tool can migrate databases whose tables are named differently. Column names
 /// (and order) are part of the config too, so a library caller can remap them.
 #[derive(Debug, Clone)]
@@ -190,7 +192,7 @@ fn blob_to_f32(blob: &[u8]) -> Vec<f32> {
         .collect()
 }
 
-/// Read all data from a ZeroClaw SQLite database.
+/// Read all data from a source SQLite database.
 ///
 /// If `skip_deleted` is true, rows with `deleted=1` are excluded from chunks.
 /// If `embedding_dim` is `None`, auto-detect from the first row (0 when there