chore: example of sync protocol interop pluto and charon

crates/dkg/examples/interop/README.md

@@ -0,0 +1,136 @@
+# Pluto + Charon Sync Interop Demo
+
+Manual 5-terminal interop demo for `dkg/sync`.
+
+Pre-step:
+- generate shared fixture once
+
+Runtime topology:
+- terminal 1: Pluto relay
+- terminal 2: Pluto node 0
+- terminal 3: Pluto node 1
+- terminal 4: Charon node 2
+- terminal 5: Charon node 3
+
+Assumptions:
+- relay URL: `http://127.0.0.1:8888`
+- shared fixture dir: `/tmp/pluto-sync-interop`
+
+Set these once in every terminal:
+
+```bash
+PLUTO_CODE_DIR=/path/to/charon-rs
+CHARON_CODE_DIR=/path/to/charon
+```
+
+## Pre-step: Build Charon And Create Shared Fixture
+
+Run:
+
+```bash
+cd "$CHARON_CODE_DIR"
+go build -o /tmp/charon .
+/tmp/charon create cluster \
+  --cluster-dir /tmp/pluto-sync-interop \
+  --nodes 4 \
+  --num-validators 1 \
+  --network holesky \
+  --insecure-keys \
+  --fee-recipient-addresses 0x000000000000000000000000000000000000dEaD \
+  --withdrawal-addresses 0x000000000000000000000000000000000000dEaD
+```
+
+This creates:
+- `/tmp/pluto-sync-interop/node0`
+- `/tmp/pluto-sync-interop/node1`
+- `/tmp/pluto-sync-interop/node2`
+- `/tmp/pluto-sync-interop/node3`
+
+After this finishes, close that terminal. The runtime demo uses 5 terminals total.
+
+## Terminal 1: Start Relay
+
+Run from Pluto repo root:
+
+```bash
+cd "$PLUTO_CODE_DIR"
+cargo run -p pluto-relay-server --example relay_server
+```
+
+Leave it running.
+
+## Terminal 2: Start Pluto Node 0
+
+Run from Pluto repo root:
+
+```bash
+cd "$PLUTO_CODE_DIR"
+cargo run -p pluto-dkg --example sync -- \
+  --relays http://127.0.0.1:8888 \
+  --data-dir /tmp/pluto-sync-interop/node0
+```
+
+## Terminal 3: Start Pluto Node 1
+
+Run from Pluto repo root:
+
+```bash
+cd "$PLUTO_CODE_DIR"
+cargo run -p pluto-dkg --example sync -- \
+  --relays http://127.0.0.1:8888 \
+  --data-dir /tmp/pluto-sync-interop/node1
+```
+
+## Terminal 4: Start Charon Node 2
+
+Run from Pluto repo root:
+
+```bash
+cd "$PLUTO_CODE_DIR"
+CHARON_DIR="$CHARON_CODE_DIR" \
+bash ./crates/dkg/examples/interop/charon_sync_demo.sh \
+  --data-dir /tmp/pluto-sync-interop/node2 \
+  --relay-url http://127.0.0.1:8888
+```
+
+## Terminal 5: Start Charon Node 3
+
+Run from Pluto repo root:
+
+```bash
+cd "$PLUTO_CODE_DIR"
+CHARON_DIR="$CHARON_CODE_DIR" \
+bash ./crates/dkg/examples/interop/charon_sync_demo.sh \
+  --data-dir /tmp/pluto-sync-interop/node3 \
+  --relay-url http://127.0.0.1:8888
+```
+
+## Recommended Startup Order
+
+1. Run the pre-step once to create the fixture.
+2. Start relay in terminal 1.
+3. Start Pluto node 0 in terminal 2.
+4. Start Pluto node 1 in terminal 3.
+5. Start Charon node 2 in terminal 4.
+6. Start Charon node 3 in terminal 5.
+
+## Success Signals
+
+On Pluto nodes:
+- `Relay reservation accepted`
+- `Connection established`
+- `All sync clients connected`
+- `Sync step reached`
+- `Sync demo is now idling until Ctrl+C`
+
+On Charon nodes:
+- `Started charon sync demo`
+- `Waiting for peers to connect`
+- `All peers connected`
+- `Sync step reached local_node=... step=1`
+- `Sync step reached local_node=... step=2`
+- `Sync demo is now idling until Ctrl+C`
+
+## Stop The Demo
+
+Press `Ctrl+C` in any node terminal.