chore(vscode): prepare 0.8.9 marketplace release

Bumps the extension past the published 0.8.8 so the apis { } editor
tooling can ship: highlighting, api. completion and hover, the api=
attribute, the repositioned removed-block diagnostics, and the fix for
the spurious "Cannot find name 'api'" error.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

editors/vscode/CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## 0.8.9
+
+- Added highlighting for the page-level `apis { }` block and its `<name> <METHOD> <path>` entries,
+  along with container and entry completion snippets.
+- Added `api.` call completion listing every declared block with its method and path, and hover
+  reporting a block's method, path, and request fields.
+- Taught the language server the `api="…"` binding attribute: it is no longer treated as unknown,
+  and completion inside its quotes offers the page's block names.
+- Diagnostics for the removed `ssr { … }` / `client { … }` data blocks now name the `apis { }`
+  replacement and land on the offending keyword instead of the start of the file.
+- Fixed `api.<name>()` calls reporting a spurious "Cannot find name 'api'" error, and the implicit
+  `any` that followed from it.
+- Restricted API hover to real `api.<name>` references, so a local variable that merely shares a
+  block's name keeps its own hover information.
+- `client state { }`, `runtime = "client"`, and the `client function` modifier are unaffected —
+  only the `ssr { }` / `client { }` data-block form was removed.
+
 ## 0.8.8
 
 - Added HTML tag and attribute completions inside WRN `view` blocks, while preserving WRNexus