chore: version 2.0.0-alpha.2 + changelog

Search view: read ?q from hash, call /api/search, group hits by kind
with rank + space_id; sidebar filters for kinds and space_id; updates
on Enter or filter change.

Bumps package.json + server.js VERSION to 2.0.0-alpha.2 and pins the
/health version assertion to match.

CHANGELOG: full Plan 2 entry covering API surface, capability tiering,
audit chain extension (approve/reject events), and the SPA shell.

Security: adds safeHref() to dom.js and applies it everywhere an
API-supplied URL becomes href / src (reference media block + reference
source_url anchor + resource url anchor). javascript: and other
non-http(s)/mailto schemes from agent-suggested content can no longer
execute in the owner's browser.

Plan 2 surface is feature-complete: 22/22 tasks landed, 185 tests
across 43 files, SPA renders end-to-end including the suggest -> approve
agent flow.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "void-server",
-  "version": "2.0.0-alpha.1",
+  "version": "2.0.0-alpha.2",
   "type": "module",
   "private": true,
   "scripts": {