docs: Add v0.15 migration codemod (reactive#3852)

* docs: Add v0.15 migration codemod

jscodeshift codemod automating common v0.15 breaking changes:
- useDebounce() plain value → [value] array destructuring
- state.entityMeta → state.entitiesMeta
- MemoCache.buildQueryKey/.query state arg consolidation
- INVALID import → delegate.INVALID / delegate.invalidate()

Includes tests and blog post references linking the codemod.

Made-with: Cursor

* test(codemod): fix no-op expected output in v0.15 tests

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix useDebounce codemod typed annotation handling

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix entityMeta codemod computed-member matching

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix v0.15 codemod export specifier INVALID handling

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix transformInvalid dirty flag no-op rewrites

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix entityMeta codemod for identifier object keys

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

* Fix transformEntityMeta to handle identifier-keyed properties

The StringLiteral handler at lines 81-94 renames string-literal property
keys ({ 'entityMeta': value }) but no equivalent handler existed for the
far more common identifier property keys in object literals or patterns.

Add an Identifier handler that covers:
- Identifier keys: { entityMeta: value } → { entitiesMeta: value }
- Shorthand properties: { entityMeta } → { entitiesMeta: entityMeta }
- Destructuring patterns: const { entityMeta } = state → const { entitiesMeta: entityMeta } = state
- Non-shorthand destructuring: const { entityMeta: meta } = state → const { entitiesMeta: meta } = state
- Computed keys are correctly skipped: { [entityMeta]: value } unchanged

Co-authored-by: Nathaniel Tucker <me@ntucker.me>

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: ntucker

website/blog/2026-01-06-v0.15-vue-support-collection-remove.md

@@ -27,6 +27,12 @@ import Link from '@docusaurus/Link';
 - [ImmutableJS support moved to /imm exports](/blog/2026/01/06/v0.15-vue-support-collection-remove#immutablejs)
 - [Schema delegate interface consolidation](/blog/2026/01/06/v0.15-vue-support-collection-remove#schema-delegate)
 
+Upgrade with an automated [codemod](/codemods/v0.15.js) for common breaking changes:
+
+```bash
+npx jscodeshift -t https://dataclient.io/codemods/v0.15.js --extensions=ts,tsx,js,jsx src/
+```
+
 <!-- truncate -->
 
 import DiffEditor from '@site/src/components/DiffEditor';
@@ -286,6 +292,12 @@ This upgrade requires updating all package versions simultaneously.
 
 <PkgTabs pkgs="@data-client/react@^0.15.0 @data-client/rest@^0.15.0 @data-client/test@^0.15.0 @data-client/img@^0.15.0" upgrade />
 
+An automated [codemod](/codemods/v0.15.js) handles the breaking changes below:
+
+```bash
+npx jscodeshift -t https://dataclient.io/codemods/v0.15.js --extensions=ts,tsx,js,jsx src/
+```
+
 ### useDebounce() returns [val, isPending] {#usedebounce}
 
 [useDebounce()](/docs/api/useDebounce) now returns a tuple with pending state, matching patterns from React 19's `useTransition`. [#3459](https://github.com/reactive/data-client/pull/3459)