anchor.isokron.ai — kronicle-lite checkpoint anchoring

POST /v1/anchor                        bearer = license key; body {chain_id, pubkey, checkpoint}
GET  /v1/chains/{chain_id}             anchored ranges, roots, receipts (public)
GET  /v1/receipts/{anchor_id}          one countersigned receipt (public)
GET  /.well-known/anchor-keys.json     service public keys and rotation list
GET  /v/{chain_id}                     verify page (needs JavaScript)
GET  /healthz