fix(fedimint): gateway/guardian follow the running bitcoin container via {{BITCOIN_HOST}}

The gateway crash-looped dialing bitcoind at host.archipelago:8332 (the
host gateway IP, where bitcoind does not listen). Root-cause fix, three
parts:

- fedimint-gateway manifest: --bitcoind-url now comes from
  $FM_BITCOIND_URL, filled by a {{BITCOIN_HOST}} derived-env — works on
  Knots, Core, or any future Bitcoin distro.
- fedimint manifest: same derived-env replaces the hardcoded
  FM_BITCOIND_URL=http://bitcoin-knots:8332 environment entry.
- orchestrator: removed the hardcoded FM_BITCOIND_URL=bitcoin-knots
  override that clobbered the derived-env, and bitcoin_host() now
  accepts any running bitcoin*/bitcoin container (excluding -ui and
  archy-* sidecars), preferring the known names in order.

Catalog regenerated + signed (nodes install from the signed catalog, so
the manifest fixes only reach them via this regen).

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

core/archipelago/src/container/prod_orchestrator.rs

@@ -3094,8 +3094,9 @@ impl ProdContainerOrchestrator {
                 .unwrap_or_else(|| "bitcoin-knots".to_string());
         }
         #[allow(unreachable_code)]
-        // Mirrors api::rpc::package::dependencies (the legacy install path);
-        // both Bitcoin node variants are reachable on archy-net by name.
+        // The known Bitcoin node containers, preferred in order. Any archy
+        // Bitcoin distribution runs as a container named `bitcoin-<distro>`
+        // (or bare `bitcoin`), all reachable on archy-net by name.
         const BITCOIN_NAMES: &[&str] = &["bitcoin-knots", "bitcoin-core", "bitcoin"];
         let names = tokio::process::Command::new("podman")
             .args(["ps", "--format", "{{.Names}}"])
@@ -3105,12 +3106,23 @@ impl ProdContainerOrchestrator {
             .filter(|o| o.status.success())
             .map(|o| String::from_utf8_lossy(&o.stdout).into_owned())
             .unwrap_or_default();
-        names
-            .lines()
-            .map(|l| l.trim())
-            .find(|name| BITCOIN_NAMES.contains(name))
-            .map(|name| name.to_string())
-            .unwrap_or_else(|| "bitcoin-knots".to_string())
+        let running: Vec<&str> = names.lines().map(|l| l.trim()).collect();
+        // Prefer a known name in priority order…
+        if let Some(hit) = BITCOIN_NAMES.iter().find(|n| running.contains(n)) {
+            return hit.to_string();
+        }
+        // …else accept ANY running `bitcoin-*` / `bitcoin` container, so a
+        // future Bitcoin distribution archy ships works without editing this
+        // list (user req 2026-07-22). Excludes companions/sidecars like
+        // `bitcoin-ui` and `archy-*`.
+        if let Some(other) = running.iter().find(|n| {
+            (**n == "bitcoin" || n.starts_with("bitcoin-"))
+                && !n.ends_with("-ui")
+                && !n.starts_with("archy-")
+        }) {
+            return other.to_string();
+        }
+        "bitcoin-knots".to_string()
     }
 
     #[cfg(test)]
@@ -3247,10 +3259,10 @@ impl ProdContainerOrchestrator {
         let mut env = manifest.app.environment.clone();
         env.extend(manifest.app.container.resolve_derived_env(&facts));
 
-        if manifest.app.id == "fedimint" || manifest.app.id == "fedimintd" {
-            env.retain(|entry| !entry.starts_with("FM_BITCOIND_URL="));
-            env.push("FM_BITCOIND_URL=http://bitcoin-knots:8332".to_string());
-        }
+        // FM_BITCOIND_URL now comes from the manifest's {{BITCOIN_HOST}}
+        // derived_env (works on Knots/Core/any distro). The old hardcoded
+        // `bitcoin-knots` override was removed 2026-07-22 — it defeated the
+        // derived-env and broke Core nodes.
 
         let provider = FileSecretsProvider {
             root: self.secrets_dir.clone(),