Add Iroh peer ping

README.md

@@ -76,6 +76,7 @@ The bootstrap implementation provides:
 - `geth peer export [--out <path>]`
 - `geth peer import <path>`
 - `geth peer list`
+- `geth peer ping <node-id>`
 - `geth resource list`
 - `geth resource create <kind> <name>`
 - `geth keychain init [--admin-key <path>]`
@@ -116,9 +117,11 @@ The bootstrap implementation provides:
   - `geth ssh revocation import <path> [--format jsonl|openssh-krl-spec]`
 - local pipe registry commands: `geth pipe listen/connect`
 
-`geth peer export/import/list` is for untrusted peer-card exchange while live
-LAN discovery and authenticated Iroh dialing are still being built. Importing a
-peer card never grants capabilities by itself.
+`geth peer export/import/list` is for untrusted peer-card exchange. Peer cards
+include the Iroh EndpointID plus currently known relay/direct addresses.
+`geth peer ping <node-id>` uses the local daemon's Iroh endpoint to dial an
+imported peer card and exchange a signed candidate-only peer-card ping.
+Importing or pinging a peer card never grants capabilities by itself.
 
 Other command groups exist as explicit stubs: `ssh proxy`.