feat(peer-cli): add just recipe for scenario matrix

Add a peer-cli-tests just recipe as the public entry point for the existing
extended scenario runner. The recipe depends on peer-cli-image, so Docker
uses its normal layer cache to decide whether the image needs rebuilding
before the Python harness runs.

This gives contributors one memorable command for the full S1-S47 matrix
while still allowing selected scenarios as positional arguments. The
underlying runner continues to own container topology and JSONL command/event
handling.

Test Plan:
- just --list
- just --dry-run peer-cli-tests S39 S40
- git diff --check

Refs: PEER_CLI_SCENARIOS.md

crates/lanspread-peer-cli/README.md

@@ -9,6 +9,7 @@ and writes JSONL events, results, and errors to stdout.
 ```bash
 just peer-cli-build
 just peer-cli-image
+just peer-cli-tests
 just peer-cli-run alpha
 ```
 

justfile

@@ -47,6 +47,9 @@ peer-cli-image:
     mkdir -p "$DOCKER_CONFIG"
     docker build -f crates/lanspread-peer-cli/Dockerfile -t lanspread-peer-cli:dev .
 
+peer-cli-tests *SCENARIOS: peer-cli-image
+    python3 crates/lanspread-peer-cli/scripts/run_extended_scenarios.py {{ SCENARIOS }}
+
 # macvlan: each peer container gets its own MAC/IP on the real LAN.
 # Override on the command line if your LAN differs, e.g.
 #   just LANSPREAD_PARENT_IFACE=enp4s0 LANSPREAD_SUBNET=10.0.0.0/24 LANSPREAD_GATEWAY=10.0.0.1 peer-cli-net