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infra (buckets.py): add cc.public / cc.institutes / cc.admin to the bucket provisioner alongside cc.examboards; make initialize_buckets idempotent (already-exists treated as success). Bucket provisioning stays in infra init. new (seed_exam_corpus.py): manifest-driven loader scaffold that USES the buckets (does not create them) — validate -> upload to cc.examboards (canonical path) -> upsert eb_specifications/eb_exams -> optional user test subset -> optional --first-sweep auto-map pass. TODOs marked for the gathering task to complete. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>