agents: define the work dir name once and test its creation

hive-c0re/src/coordinator.rs

@@ -1135,7 +1135,7 @@ impl Coordinator {
     /// destroy/recreate. A sibling of `state/` rather than inside it, so a
     /// claude started under `work/` never walks up into `state/CLAUDE.md`.
     pub fn agent_work_dir(name: &hive_types::Ident) -> PathBuf {
-        crate::paths::agent_state_dir(name).join("work")
+        crate::paths::agent_state_dir(name).join(crate::paths::WORK_SUBDIR)
     }
 
     /// Per-agent harness-internal state dir. Bind-mounted RW into the

hive-c0re/src/lifecycle/host_config.rs

@@ -198,7 +198,7 @@ fn bind_own_agent_dirs(agent_name: &str, notes_dir: &Path, binds: &mut Vec<BindM
         read_only: false,
     });
     if let Some(state_parent) = notes_dir.parent() {
-        for sub in ["harness", "work"] {
+        for sub in ["harness", crate::paths::WORK_SUBDIR] {
             let dir = state_parent.join(sub);
             if !dir.exists() {
                 let _ = std::fs::create_dir_all(&dir);

hive-c0re/src/lifecycle/setup.rs

@@ -218,7 +218,7 @@ pub fn ensure_state_dir(notes_dir: &Path) -> Result<()> {
     }
     // Harness and work dirs are siblings of the agent-visible state dir.
     if let Some(parent) = notes_dir.parent() {
-        for sibling in ["harness", "work"] {
+        for sibling in ["harness", crate::paths::WORK_SUBDIR] {
             let dir = parent.join(sibling);
             if !dir.exists() {
                 std::fs::create_dir_all(&dir)

hive-c0re/src/lifecycle/tests.rs

@@ -410,3 +410,14 @@ async fn a_prebuild_inside_its_limit_returns_its_status() {
         .expect("a fast child must not time out");
     assert_eq!(status.code(), Some(3));
 }
+
+/// The setup path creates the agent's `work/` dir beside `state/`, so the
+/// bind source exists before nspawn starts the container.
+#[test]
+fn ensure_state_dir_creates_the_work_dir() {
+    let root = tempfile::tempdir().expect("tempdir");
+    let notes_dir = root.path().join("state");
+    ensure_state_dir(&notes_dir).expect("ensure_state_dir");
+    assert!(notes_dir.is_dir());
+    assert!(root.path().join(crate::paths::WORK_SUBDIR).is_dir());
+}

hive-c0re/src/paths.rs

@@ -30,6 +30,10 @@ use std::path::{Path, PathBuf};
 // its own callsites.
 pub use hive_host_sock::{AGENTS_ROOT, GATEWAY_HTPASSWD, HOST_SOCKET, agent_state_dir};
 
+/// Name of the per-agent working dir under `agents/<name>/`, a sibling of
+/// `state/`. Bound RW into the container at `/agents/<name>/work`.
+pub const WORK_SUBDIR: &str = "work";
+
 /// Root of all hive-c0re persistent state.
 // nix: the same literal is written in `nix/host-modules/hive-c0re/default.nix` — must match.
 //      Not option-driven: there is no `statePath` option, the path is hardcoded both sides.