add probe subcommand for end-to-end relay health checks

Implements grasp-audit probe with full write path (publish events,
poll for repo init, push, verify refs match state) and read-only
fallback (find existing announcement, fetch refs). Supports --nsec
for whitelisted relays, --json output, and --watch for continuous
monitoring.

1 files changed, 1 insertions, 0 deletions

diff --git a/grasp-audit/Cargo.toml b/grasp-audit/Cargo.toml
index 789a9ca..9e97b16 100644
--- a/grasp-audit/Cargo.toml
+++ b/grasp-audit/Cargo.toml
@@ -18,6 +18,7 @@ nostr-sdk = { git = "https://github.com/rust-nostr/nostr", rev = "4767ad13" }
 tokio = { version = "1", features = ["full"] }
 
 # Serialization
+serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 
 # Error handling