hive-subagent-mcp: new crate for the subagent daemon, independent of hive-bash-mcp

hive-subagent-mcp/src/paths.rs

@@ -0,0 +1,15 @@
+//! The one per-agent path this daemon needs.
+
+use std::path::PathBuf;
+
+/// The harness-served in-agent todo socket (loose-ends v2). This daemon
+/// pushes exactly one todo per subagent lifetime — the completion summary,
+/// once its background turn finishes. Override via `HIVE_AGENT_SOCKET`;
+/// same resolution as `hive-bash-mcp`'s own `paths::agent_socket`.
+#[must_use]
+pub fn agent_socket() -> PathBuf {
+    std::env::var_os("HIVE_AGENT_SOCKET").map_or_else(
+        || PathBuf::from(hive_agent_sock::DEFAULT_AGENT_SOCKET),
+        PathBuf::from,
+    )
+}