refactor(#2285): repoint all hive-c0re host-path consumers to paths.rs

hive-c0re/src/meta.rs

@@ -13,8 +13,6 @@ use tokio::sync::Mutex;
 use crate::coordinator::HiveEnv;
 use crate::lifecycle;
 
-const META_ROOT: &str = "/var/lib/hyperhive/meta";
-const APPLIED_ROOT: &str = "/var/lib/hyperhive/applied";
 const GIT_NAME: &str = "c0re";
 const GIT_EMAIL: &str = "c0re@hyperhive.local";
 
@@ -60,7 +58,7 @@ pub struct AgentSpec {
 
 #[must_use]
 pub fn meta_dir() -> PathBuf {
-    PathBuf::from(META_ROOT)
+    crate::paths::meta_root()
 }
 
 /// Idempotently reconcile the meta repo with the current agent set.
@@ -840,7 +838,7 @@ fn ca_embed_state(dir: &std::path::Path) -> (Vec<(String, String)>, bool) {
 /// Returns an empty vec when the lock is missing or unparsable —
 /// safe degradation, the worst case is no dedup for that agent.
 fn agent_canonical_inputs(name: &str) -> Vec<&'static str> {
-    let path = std::path::PathBuf::from(format!("{APPLIED_ROOT}/{name}/flake.lock"));
+    let path = crate::paths::applied_dir(name).join("flake.lock");
     let Ok(raw) = std::fs::read_to_string(&path) else {
         return Vec::new();
     };
@@ -931,8 +929,9 @@ where
     for spec in agents {
         let _ = writeln!(
             out,
-            "    agent-{}.url = \"git+file://{APPLIED_ROOT}/{}\";",
-            spec.name, spec.name,
+            "    agent-{}.url = \"git+file://{}\";",
+            spec.name,
+            crate::paths::applied_dir(&spec.name).display(),
         );
         // For each canonical input the agent declares in its own
         // `flake.nix` (detected by reading its applied `flake.lock`),