fix(plugins): scan all bundle scripts, allow audited scanner override

Two problems with the upload scanner, pulling in opposite directions.

It only scanned the entrypoint, so a bundle with `eval()` in a second
file passed outright — verified against a synthetic bundle whose
vendor/openpgp.js tripped three patterns while index.js stayed clean.

At the same time, a hard 400 on eval()/new Function()/innerHTML= makes
every crypto plugin uninstallable: minified openpgp.js and pkijs
legitimately contain all three. That blocks S/MIME and PGP entirely.

Scan every .js/.mjs in the bundle and return structured findings
({file, patterns[]}) plus canOverride, so the admin can see exactly what
tripped and where. An explicit overrideWarnings=true proceeds and writes
a plugin.install.scan_override audit entry recording which patterns in
which files were accepted — not merely that an override happened.

This route is already admin-authenticated, so the scan is defence in
depth against an accidental or compromised upload, not a trust boundary.
Treating it as the latter is what made crypto plugins uninstallable.

Also log the B-04 and B-01 divergences in vnc/VNC-CHANGES.md.

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

app/api/admin/plugins/route.ts

@@ -158,15 +158,47 @@ export async function POST(request: NextRequest) {
     }
     const code = await entryFile.async('string');
 
-    // Security: block plugins containing dangerous JS patterns
-    const warnings: string[] = [];
-    for (const { pattern, label } of SUSPICIOUS_JS_PATTERNS) {
-      if (pattern.test(code)) warnings.push(`Contains ${label}`);
-      pattern.lastIndex = 0;
+    // Security: scan for dangerous JS patterns across EVERY script in the
+    // bundle, not just the entrypoint - a second .js file was previously never
+    // looked at.
+    //
+    // The result is a reviewable finding rather than an unconditional reject.
+    // Minified crypto libraries (openpgp.js, pkijs) legitimately contain these
+    // patterns, so a hard block makes S/MIME and PGP plugins uninstallable.
+    // This route is already admin-authenticated, so the scan is defence in
+    // depth against an accidental or compromised upload, not a trust boundary:
+    // an admin may proceed with `overrideWarnings`, and the override is
+    // recorded in the audit log with the exact findings.
+    const findings: Array<{ file: string; patterns: string[] }> = [];
+    for (const [filePath, entry] of Object.entries(zip.files)) {
+      if (entry.dir) continue;
+      const ext = filePath.slice(filePath.lastIndexOf('.')).toLowerCase();
+      if (ext !== '.js' && ext !== '.mjs') continue;
+      const source = filePath === root + (manifest.entrypoint as string)
+        ? code
+        : await entry.async('string');
+      const hits: string[] = [];
+      for (const { pattern, label } of SUSPICIOUS_JS_PATTERNS) {
+        if (pattern.test(source)) hits.push(label);
+        pattern.lastIndex = 0;
+      }
+      if (hits.length > 0) {
+        findings.push({ file: filePath.slice(root.length), patterns: hits });
+      }
     }
-    if (warnings.length > 0) {
+
+    const overrideWarnings = formData.get('overrideWarnings') === 'true';
+    if (findings.length > 0 && !overrideWarnings) {
+      const summary = findings
+        .map(f => `${f.file}: ${f.patterns.join(', ')}`)
+        .join('; ');
       return NextResponse.json(
-        { error: `Plugin rejected: ${warnings.join(', ')}. These patterns are not allowed for security reasons.` },
+        {
+          error: `Plugin rejected: ${summary}. Review the bundle; if these are expected `
+            + `(e.g. a vendored crypto library), re-upload with "overrideWarnings" to proceed.`,
+          findings,
+          canOverride: true,
+        },
         { status: 400 },
       );
     }
@@ -212,6 +244,16 @@ export async function POST(request: NextRequest) {
     await savePlugin(plugin, code);
     invalidateFrameOriginsCache();
     await auditLog('plugin.install', { id: plugin.id, name: plugin.name, version: plugin.version, frameOrigins: declaredFrameOrigins, httpOrigins: declaredHttpOrigins, apiPostPaths: declaredApiPostPaths }, ip);
+    if (findings.length > 0) {
+      // Record WHAT was waved through, not merely that an override happened -
+      // otherwise the audit trail can't answer "which patterns did we accept?".
+      await auditLog(
+        'plugin.install.scan_override',
+        { id: plugin.id, version: plugin.version, findings },
+        ip,
+      );
+      logger.warn('Plugin installed with scanner override', { id: plugin.id, findings });
+    }
 
     return NextResponse.json({ plugin });
   } catch (error) {