docs(connectors): prep 2026.6.1 release notes and group connectors by kind [roadmap:rac-connectors]

CHANGELOG.md

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+# Changelog
+
+All notable changes to `rac-connectors` are recorded here. Versions are CalVer
+(`YYYY.M.N`, ADR-008); the version is derived from the git tag by setuptools-scm,
+and the published distribution is `rac-connectors`.
+
+## 2026.6.1
+
+First published release of **rac-connectors** — the integrations companion for
+RAC (requirements-as-code): one distribution covering the backend connectors
+(ADR-073), renamed from the former `lore-connectors` under the `rac-*` topology
+(ADR-092, ADR-095).
+
+### Added
+
+- The `rac-connect` CLI and the connector library, one subdir per integration
+  under `src/rac_connectors/`: `supermemory`, `mem0`, `zep`, `letta`, `cognee`,
+  and the `neo4j` graph connector.
+- Thin export-contract consumers over `rac export --documents` / `--graph` and the
+  public `rac` CLI — no engine internals, no embeddings or model calls (ADR-063,
+  ADR-002).
+
+### Changed
+
+- Renamed from `lore-connectors` / `lore_connectors`: distribution
+  `rac-connectors`, import package `rac_connectors`, CLI `lore-connect` →
+  `rac-connect`.
+- Outbound record id field `lore_id` → `rac_id` (cognee header `Lore-Id:` →
+  `Rac-Id:`); the value is unchanged (the canonical `RAC-*` id). `lore-connectors`
+  was never published to PyPI, so there is no migration (ADR-095).