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/main.rs

@@ -12,7 +12,8 @@ use validate::ValidationSummary;
 
 type BoxErr = Box<dyn std::error::Error>;
 
-/// Migrate ZeroClaw agent memory from SQLite to a clawhdf5-agent store.
+/// Migrate agent memory from SQLite (memory_chunks / sessions / entities /
+/// relations tables) to a clawhdf5-agent store.
 ///
 /// The output is an ordinary agent store: open it with
 /// `HDF5Memory::open` (or `clawhdf5-cli --path <store> ...`).
@@ -270,7 +271,7 @@ mod tests {
     use std::path::PathBuf;
     use tempfile::TempDir;
 
-    /// Create a test SQLite database with the ZeroClaw schema.
+    /// Create a test SQLite database with the default migration layout.
     fn create_test_db(dir: &TempDir) -> String {
         let db_path = dir.path().join("test.db");
         let path_str = db_path.to_str().unwrap().to_string();