Fix CI: test manifests need tools/pipes/hooks for extension type

ValidateManifest() now enforces type-specific constraints on bundled
install too. Two tests used type "extension" without any tools/pipes/hooks,
which is correctly rejected. Added hooks field to make them valid.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/handlers/packages_bundled_test.go

@@ -171,6 +171,7 @@ func TestBundledInstall_DormantPackage(t *testing.T) {
 		"id":       "dormant-pkg",
 		"title":    "Dormant Package",
 		"type":     "extension",
+		"hooks":    []string{"on_install"},
 		"requires": []string{"chat"},
 	})
 

server/handlers/upgrade_test.go

@@ -451,6 +451,7 @@ func TestUpgrade_PackageDormantOnUnmetRequires(t *testing.T) {
 		"title":    "Future",
 		"type":     "extension",
 		"version":  "1.0.0",
+		"hooks":    []string{"on_install"},
 		"requires": []string{"kernel>=99.0.0"},
 	})