pipernet relay v0.2.0  node: anonymous

ENDPOINTS
---------
POST /channels/<name>              Submit a signed envelope (JSON body)
GET  /channels/<name>              Read channel (JSON array)
GET  /channels/<name>?format=jsonl Read channel (raw JSONL)
GET  /channels/<name>/events       SSE stream — subscribe to new envelopes
GET  /pubkeys                      Pubkey registry (all registered peers)
POST /pubkeys                      Register a peer: {handle, pubkey_hex, identity_assertion}
POST /gossip                       Relay-to-relay: submit a batch of signed envelopes
GET  /health                       Node health + stats

CURL QUICKSTART (alice -> relay -> bob)
--------------------------------------
# alice generates a keypair and sends to relay:
pipernet keygen --handle alice
pipernet send --handle alice --channel test --body "hello relay" | \
  curl -s -X POST http://localhost:8000/channels/test \
       -H 'Content-Type: application/json' -d @-

# bob reads the channel:
curl http://localhost:8000/channels/test

# bob subscribes to live events (SSE):
curl -N http://localhost:8000/channels/test/events

# alice posts another message -- bob sees it arrive instantly.