fix(fips): P0 uptime fixes — open peer port 5679, allow /blob+/dwn, fix LAN anchor port, un-deaden direct peering, fast-fail budgets

Phase A1 of docs/FIPS-UPTIME-AND-UI-STATE-PLAN.md — the five changes that
made FIPS fall back to Tor even when a FIPS path existed:

- RC0: the fips.d drop-in now opens PEER_PORT 5679 (was 80+8443 only, so
  every hardened node firewalled peers' FIPS dials; 28k drops on .198)
- RC4: /blob/ and /dwn/ added to the peer-path allowlist — mesh file
  sharing and DWN sync were 404 → 100% Tor by construction
- RC2-G2: lan_fips_anchors dials PUBLISHED_UDP_PORT (2121) instead of the
  dead 8668, with a drift-guard test against the rendered daemon config
- RC2-G1: direct LAN peering actually runs now — mDNS TXT advertises the
  FIPS npub, discovery calls set_fips_npub, and the anchor tick hydrates
  npubs from federation storage for peers on older builds
- RC3: FIPS attempt budget is a hard cap (retry no longer doubles it) and
  the 12 hot call sites get explicit fips_timeout fast-fail so Tor keeps
  its full budget (browse-peer, preview, /blob, DWN, node-message,
  rotation notifies)

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

core/archipelago/src/fips/dial.rs

@@ -447,14 +447,26 @@ impl<'a> PeerRequest<'a> {
             }
         };
         let url = format!("{}{}", base, self.path);
-        let c = client_with_timeout(self.fips_attempt_timeout());
+        let budget = self.fips_attempt_timeout();
+        // With an explicit fast-fail cap, halve the per-attempt client
+        // timeout so the one-retry path in send_with_retry fits inside the
+        // budget instead of silently doubling it ("fips_timeout(6s)" used
+        // to really mean ~12.6s). Without one (long streaming downloads),
+        // keep the full budget per attempt — the client timeout also
+        // governs body streaming and must not truncate a real transfer.
+        let per_attempt = if self.fips_timeout.is_some() {
+            budget / 2
+        } else {
+            budget
+        };
+        let c = client_with_timeout(per_attempt);
         let mut rb = c.post(&url).json(body);
         for (k, v) in &self.headers {
             rb = rb.header(*k, v);
         }
-        match send_with_retry(rb).await {
-            Ok(r) => Ok(Some(r)),
-            Err(e) => {
+        match tokio::time::timeout(budget, send_with_retry(rb)).await {
+            Ok(Ok(r)) => Ok(Some(r)),
+            Ok(Err(e)) => {
                 tracing::debug!(
                     "FIPS POST {} failed after retry: {}, falling back to Tor",
                     url,
@@ -462,6 +474,14 @@ impl<'a> PeerRequest<'a> {
                 );
                 Ok(None)
             }
+            Err(_) => {
+                tracing::debug!(
+                    "FIPS POST {} exceeded attempt budget {:?}, falling back to Tor",
+                    url,
+                    budget
+                );
+                Ok(None)
+            }
         }
     }
 
@@ -480,14 +500,22 @@ impl<'a> PeerRequest<'a> {
             }
         };
         let url = format!("{}{}", base, self.path);
-        let c = client_with_timeout(self.fips_attempt_timeout());
+        let budget = self.fips_attempt_timeout();
+        // Same budget discipline as the POST path: halve per attempt only
+        // under an explicit fast-fail cap; hard-cap the retry sequence.
+        let per_attempt = if self.fips_timeout.is_some() {
+            budget / 2
+        } else {
+            budget
+        };
+        let c = client_with_timeout(per_attempt);
         let mut rb = c.get(&url);
         for (k, v) in &self.headers {
             rb = rb.header(*k, v);
         }
-        match send_with_retry(rb).await {
-            Ok(r) => Ok(Some(r)),
-            Err(e) => {
+        match tokio::time::timeout(budget, send_with_retry(rb)).await {
+            Ok(Ok(r)) => Ok(Some(r)),
+            Ok(Err(e)) => {
                 tracing::debug!(
                     "FIPS GET {} failed after retry: {}, falling back to Tor",
                     url,
@@ -495,6 +523,14 @@ impl<'a> PeerRequest<'a> {
                 );
                 Ok(None)
             }
+            Err(_) => {
+                tracing::debug!(
+                    "FIPS GET {} exceeded attempt budget {:?}, falling back to Tor",
+                    url,
+                    budget
+                );
+                Ok(None)
+            }
         }
     }