Prepare v0.2.1 release

docs/releases/v0.2.1.md

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+# Omnigraph v0.2.1
+
+Omnigraph v0.2.1 is a focused follow-up release on top of v0.2.0. It adds query linting, improves query execution correctness, hardens the local RustFS bootstrap flow, and cleans up project config naming.
+
+## Highlights
+
+### Query lint and check
+
+The CLI now ships a first-class query validation surface:
+
+- `omnigraph query lint`
+- `omnigraph query check`
+
+These commands validate `.gq` files against either an explicit schema file or a local/S3-backed repo schema, emit structured results, and support both human-readable and JSON output.
+
+### Query execution fixes and aggregate support
+
+This release includes several improvements in the query engine:
+
+- aggregate execution support for read queries
+- nullable query parameters now accept omission and explicit null for nullable params
+- traversal planning and join alignment are more robust for traversal-introduced bindings
+
+Together, these changes make complex read queries more dependable and easier to author.
+
+### Better local RustFS startup
+
+The local RustFS bootstrap is more resilient:
+
+- detects dirty/stale repo prefixes before blindly reinitializing
+- makes bootstrap recovery clearer for persisted local RustFS state
+- ships a more generic demo fixture instead of user-specific seed content
+
+This reduces the most common failure mode in local-first setup.
+
+### Config terminology cleanup
+
+`omnigraph.yaml` now uses graph-oriented naming:
+
+- `graphs:` instead of `targets:`
+- `cli.graph` / `server.graph` instead of `target`
+
+This removes one of the more confusing overloaded terms in the CLI/server config model.
+
+## Included Changes
+
+- PR #15: query lint and query check commands
+- PR #6: aggregate execution support
+- PR #3: nullable query parameter fixes
+- PR #16: traversal planning and join-alignment fixes
+- PR #13: local RustFS bootstrap recovery hardening
+- PR #14: generic bootstrap fixture
+- PR #17: config rename from targets to graphs
+
+## Upgrade Notes
+
+- If you maintain `.gq` files in-repo, add `omnigraph query lint` to your local validation workflow
+- Existing configs must use `graphs:` / `graph:` after this release
+- Local RustFS users should prefer the current bootstrap script from `main` or this release rather than older cached copies