Fundament: Doku, Testanpassungen, Restbereinigung

- AGENTS.md und README.md auf Craftvia umgeschrieben (Regeln, Andockpunkte,
  Stack mit Garage, tsx-Tests, Gate, Demo-Logins)
- ISMS-Dokumente entfernt (SPEC, Prototypen, Lane-Prompts, Übergaben, Konzepte
  Incidents/Framework); Fundament-Doku (Deploy, Sicherheit, Backup, Identity) bleibt
- Fundament-Tests an Craftvia-Rollen/Branding angepasst, Resttreffer
  certvia/isms in Skripten und Kommentaren bereinigt

Gate: prisma generate, migrate status, tsc, lint, build, 22/22 Testskripte grün.

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

scripts/test-backup-target.ts

@@ -81,7 +81,7 @@ async function main() {
       cfg({
         backupTarget: "s3",
         backupS3Endpoint: "http://minio:9000",
-        backupS3Bucket: "certvia-backups",
+        backupS3Bucket: "craftvia-backups",
         backupS3AccessKey: "AK",
         backupS3SecretKey: "SK",
       }),
@@ -134,7 +134,7 @@ async function main() {
   {
     const store = resolveBackupStore(cfg({ backupTarget: "local", backupLocalDir: join(tmp, "conn") }));
     const key = "__connectivity-test__/probe.txt";
-    const payload = Buffer.from("certvia connectivity", "utf8");
+    const payload = Buffer.from("craftvia connectivity", "utf8");
     await store.put(key, payload);
     const back = await store.get(key);
     ok(!!back && back.equals(payload), "put→get liefert identische Bytes");