docs: rename annotations-reference to attributes-reference

[oojacoboo]

Stacked on top of #799 (the anchor/prose cleanup PR). Please merge #799 first, then this one.

Summary

Doctrine annotation support was dropped in #677; the page's body has been calling these "attributes" for a long time (the title is already Attributes reference). This PR brings the filename and URL slug in line so the whole stack uses consistent terminology, and cuts a new docs version (8.2.0) to capture the current state of docs/ as a released snapshot.

What changed

Rename

• docs/annotations-reference.md → attributes-reference.md (plus frontmatter id and sidebars.json entry).
• Incoming link in docs/authentication-authorization.mdx updated.
• Anchor fragments in docs/CHANGELOG.md and docs/migrating.md were already stale (sections were renamed from ## @Input annotation → ## #[Input] long ago); repointed them at the current slugs (#input, #field, #hideifunauthorized) and stripped the dead -annotation suffix.

New docs version: 8.2.0

Generated via yarn docusaurus docs:version 8.2.0. This captures the current state of docs/ — the rename, the prose cleanup, and already-merged-to-master but unreleased features like #[EnumValue] (#793) — as a new versioned release. 8.2.0 becomes the new "latest" in versions.json, so /docs/* now serves from it.

Minor docs-version snapshots are established convention in this project (6.1, 4.3, 4.2, 4.1 are all on record), so cutting 8.2.0 alongside this rename does not break norms.

versioned_docs/version-8.0.0/ is untouched — it remains the frozen v8.0.0 release snapshot and diffs to zero against master.

Backwards compatibility

Added @docusaurus/plugin-client-redirects (pinned to the existing 2.4.3 line) with a single rule: /docs/annotations-reference → /docs/attributes-reference. External inbound links keep working; the generated redirect uses <meta http-equiv="refresh"> + a JS fallback that preserves the URL fragment (so #input-annotation style bookmarks still land on the same place they would have before).

Remaining prose cleanup

While touching this area, also fixed a few stale "annotation" prose references that the Doctrine removal missed:

• custom-types.mdx — "in the following annotations:" → "in the following attributes:"
• semver.md — "mainly through its annotations" / "developing custom annotations" → "attributes"
• argument-resolving.md — stale @Autowire annotation and related wording in the parameter-middleware example

Intentionally left alone: doctrine-annotations-attributes.mdx (migration guide), real PHP symbol names (TheCodingMachine\GraphQLite\Annotations\*, MiddlewareAnnotations, ParameterAnnotations), and the annotations parameter of #[SourceField]/#[MagicField] (actual PHP parameter name in source).

URLs after merge

URL	Resolves to
/docs/annotations-reference	redirects to /docs/attributes-reference
/docs/attributes-reference	v8.2.0 (new latest)
/docs/8.0.0/annotations-reference	v8.0.0 snapshot, frozen, unchanged
/docs/next/attributes-reference	docs/ preview

Review note

The second commit on this PR (revert v8.0.0 edits and cut v8.2.0 snapshot instead) corrects a first-pass approach that mistakenly edited versioned_docs/version-8.0.0/ to keep the redirect target valid. That was revisionist — frozen snapshots shouldn't be modified for unreleased terminology. The proper fix is to cut a new version, which is what this PR now does. Happy to squash on merge if preferred.

Test plan

• yarn build passes cleanly (no unresolved markdown links).
• build/docs/annotations-reference/index.html contains a <meta http-equiv="refresh"> pointing at /docs/attributes-reference, plus a JS fallback that appends window.location.hash.
• build/docs/attributes-reference.html generated from v8.2.0.
• build/docs/8.0.0/annotations-reference.html still generated from the unchanged v8.0.0 snapshot.
• git diff origin/master -- website/versioned_docs/version-8.0.0/ website/versioned_sidebars/version-8.0.0-sidebars.json returns empty.
• After merge, smoke-test the deployed site: /docs/annotations-reference redirects to /docs/attributes-reference; /docs/annotations-reference#field preserves the fragment.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (53f9d49) to head (a947224).
⚠️ Report is 151 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #800      +/-   ##
============================================
- Coverage     95.72%   94.84%   -0.89%     
- Complexity     1773     1869      +96     
============================================
  Files           154      175      +21     
  Lines          4586     5079     +493     
============================================
+ Hits           4390     4817     +427     
- Misses          196      262      +66     

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