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/README.md

@@ -3,8 +3,11 @@
 [![crates.io](https://img.shields.io/crates/v/clawhdf5-migrate.svg)](https://crates.io/crates/clawhdf5-migrate)
 [![docs.rs](https://img.shields.io/docsrs/clawhdf5-migrate)](https://docs.rs/clawhdf5-migrate)
 
-CLI tool to migrate SQLite agent memory databases (the ZeroClaw layout) to a
-[clawhdf5-agent](https://crates.io/crates/clawhdf5-agent) store.
+CLI tool to migrate a SQLite agent-memory database in the `memory_chunks` / `sessions` / `entities` / `relations` layout (table and
+column names are configurable) to a
+[clawhdf5-agent](https://crates.io/crates/clawhdf5-agent) store. This is **not**
+ZeroClaw's schema — ZeroClaw keeps memories in a single `memories` table and
+does not use clawhdf5.
 
 The output is written through `clawhdf5-agent`'s own API, so it opens with
 `HDF5Memory::open` and is searchable immediately: memory records, sessions and