fix(#2560): make hive-core git non-interactive + bound stalled fetches

nix/host-modules/hive-c0re/default.nix

@@ -34,6 +34,15 @@ let
     [credential "http://${config.services.hyperhive.forge.domain}"]
     helper = hive-forge
     username = core
+    [http]
+    # Abort a stalled fetch instead of blocking startup indefinitely. If a
+    # git+http transfer (e.g. `nix flake lock` of the forge-hosted config
+    # inputs) drops below 1 KiB/s for 30s -- forge unreachable / not ready
+    # on cold boot -- git fails fast rather than hanging the whole daemon.
+    # Pairs with GIT_TERMINAL_PROMPT=0 (no credential-prompt hang) and the
+    # migration shellout timeout in migrate.rs.
+    lowSpeedLimit = 1024
+    lowSpeedTime = 30
   '';
 
   # git credential helper for hive-core's authenticated fetches of the