feat(fips): fallback telemetry — per-reason counters in fips.status + last-transport recording on all dial sites

Phase A2 of docs/FIPS-UPTIME-AND-UI-STATE-PLAN.md (RC6). Fallbacks to Tor
were debug!-only and uncounted, so "FIPS uptime" was unfalsifiable and
paths that were 100% Tor by construction went unnoticed for months.

- fips::telemetry: process-lifetime counters for FIPS successes and the
  six fallback reasons (no_npub, service_inactive, dns_fail, connect_fail,
  http_404, http_5xx), exposed as `dial_stats` in fips.status
- dial.rs: every fallback branch now counts + logs at info! with a
  `reason` field (resolve/connect/status branches)
- PeerRequest::record_transport(data_dir): opt-in hook that writes the
  transport actually used to federation storage off the hot path — wired
  into the dial sites that never recorded (DWN sync ×3, mesh blob fetch,
  federation deploy notify, onion-rotation notify, node messages via a
  new send_to_peer data-dir param)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/node_message.rs

@@ -342,6 +342,9 @@ pub async fn send_to_peer(
     signing_key: Option<&ed25519_dalek::SigningKey>,
     recipient_pubkey: Option<&str>,
     from_name: Option<&str>,
+    // Federation data dir for last-transport recording; None skips recording
+    // (callers without a data dir in scope).
+    record_data_dir: Option<&std::path::Path>,
 ) -> Result<()> {
     validate_onion(onion)?;
 
@@ -370,11 +373,15 @@ pub async fn send_to_peer(
         body["from_name"] = serde_json::Value::String(name.to_string());
     }
 
-    let (resp, transport) =
+    let mut req =
         crate::fips::dial::PeerRequest::new(fips_npub, onion, "/archipelago/node-message")
             .service(crate::settings::transport::PeerService::Messaging)
             .timeout(std::time::Duration::from_secs(60))
-            .fips_timeout(std::time::Duration::from_secs(8))
+            .fips_timeout(std::time::Duration::from_secs(8));
+    if let Some(dir) = record_data_dir {
+        req = req.record_transport(dir);
+    }
+    let (resp, transport) = req
             .send_json(&body)
             .await
             .map_err(|e| {