docs: audit pass — drop pre-0.7.0 release notes; scrub RFC refs from user docs (#272)

* docs: audit pass — drop pre-0.7.0 release notes; scrub RFC refs from user docs

- Delete the pre-0.7.0 release-notes archive (v0.2.0 … v0.6.2); keep v0.7.0.
- Rewrite every inline "RFC-0NN" citation in docs/user/** into durable
  plain language (the behavior is the contract, not the planning doc):
  cli/index.md, cli/reference.md, clusters/index.md, operations/{maintenance,
  policy,server}.md. Updated the in-page "Scopes & profiles" anchor to match
  the de-RFC'd heading.

No sub-0.7.0 version caveats or stale Lance-version refs were present in
docs/user/**. Dev docs, AGENTS.md, and instruction files are out of scope for
this pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs: second alignment pass — drop residual pre-cluster-only framing

- cli/reference.md: rewrite the server-scope graph-resolution rule — an
  omnigraph-server is always cluster-backed, so GET /graphs always answers and
  --graph is required; the bare-URL path is only the fallback for an
  unavailable/non-omnigraph endpoint (was "a single-graph / flat server …
  uses its bare URL as before").
- embeddings.md: "Direct single-graph serving" → "Direct (--store) access"
  (there is no single-graph serving mode under cluster-only).
- clusters/{config,index}.md: drop the removed --target flag from the
  "--cluster cannot combine with …" clauses.

Verified: no Linear tickets, no RFC refs, no single-graph-as-current, no
--target-as-combinable in docs/user/**.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/releases/v0.2.1.md

@@ -1,59 +0,0 @@
-# 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