wip(#2502): render agent config input from forge repo (meta.rs + test)

hive-c0re/src/meta.rs

@@ -923,12 +923,25 @@ where
         let _ = writeln!(out, "    hyperhive-docs.url = \"{docs_flake}\";");
         out.push_str("    hyperhive-docs.flake = false;\n");
     }
+    // Each agent's *persistent* config input is its canonical repo on the
+    // forge (`git+http://<forge>/agent-configs/<name>.git`), authenticated by
+    // hive-core's git credential helper (which reads the live `forge-core-token`
+    // — no token in the URL or lock). The deploy re-lock + `verify_commit` eval
+    // keep pinning the local `applied/<name>` override (`agent_input_override`),
+    // so a deploy never does a network fetch — only the persistent input tracks
+    // the forge. `HIVE_FORGE_URL` is the in-cluster gateway vhost, already
+    // forwarded into hive-core's env; fall back to the local forge for legacy
+    // deploys that predate the forwarding.
+    let forge_base = std::env::var("HIVE_FORGE_URL")
+        .ok()
+        .filter(|v| !v.is_empty())
+        .unwrap_or_else(|| "http://localhost:3000".to_string());
     for spec in agents {
         let _ = writeln!(
             out,
-            "    agent-{}.url = \"git+file://{}\";",
-            spec.name,
-            crate::paths::applied_dir(&spec.name).display(),
+            "    agent-{name}.url = \"git+{forge_base}/{org}/{name}.git\";",
+            name = spec.name,
+            org = crate::forge::CONFIG_ORG,
         );
         // For each canonical input the agent declares in its own
         // `flake.nix` (detected by reading its applied `flake.lock`),
@@ -1639,6 +1652,43 @@ mod tests {
         );
     }
 
+    #[test]
+    fn render_flake_agent_input_points_at_forge_config_repo() {
+        // The persistent agent config input must reference the canonical
+        // repo on the forge (git+http, org `agent-configs`), NOT the local
+        // `applied/<n>` checkout — that's what lets the config live on the
+        // forge instead of a hand-synced local copy. Auth is out-of-band via
+        // hive-core's git credential helper, so no creds appear in the URL.
+        //
+        // SAFETY: single-threaded mutation of a process env var the other
+        // tests don't assert the absence of; restored before returning.
+        unsafe {
+            std::env::set_var("HIVE_FORGE_URL", "http://forge.example.test");
+        }
+        let out = render_flake(
+            "github:example/hyperhive",
+            "path:/nix/store/bbbb-hyperhive-docs-source",
+            "path:/nix/store/aaaa-nixpkgs-source",
+            8000,
+            "she/her",
+            &std::collections::HashMap::new(),
+            &[sample_spec("alice", false, 9001)],
+        );
+        unsafe {
+            std::env::remove_var("HIVE_FORGE_URL");
+        }
+        assert!(
+            out.contains(
+                "agent-alice.url = \"git+http://forge.example.test/agent-configs/alice.git\""
+            ),
+            "expected the agent input to point at the forge config repo:\n{out}"
+        );
+        assert!(
+            !out.contains("agent-alice.url = \"git+file://"),
+            "the local applied/<n> path must no longer be the persistent input:\n{out}"
+        );
+    }
+
     #[test]
     fn render_flake_embeds_hive_ca_when_signalled() {
         // When hive-tls.nix signals a self-signed hive CA via