fix: address argus review yellows on #1158

- restore count in get_loose_ends: 'N local task(s):' instead of bare 'local task(s):'
- add cross-crate coupling comment to both mcp_loose_ends_dir() copies
- add comment in hive-bash-daemon service env explaining HYPERHIVE_HARNESS_DIR
  is already injected via systemd.globalEnvironment by the meta flake

hive-bash-mcp/src/paths.rs

@@ -51,6 +51,10 @@ pub fn hyperhive_socket() -> PathBuf {
 /// Directory where MCP daemons write loose-end summary files for the harness.
 /// Each daemon writes `<name>.json` here; the harness scans the dir in
 /// `get_loose_ends` to surface active work from all MCPs generically.
+///
+/// NOTE: the base-dir resolution logic here is intentionally mirrored in
+/// `hive-ag3nt/src/mcp_loose_ends.rs::loose_ends_dir()`. They can't share
+/// code across crates — keep them in sync if the fallback logic changes.
 #[must_use]
 pub fn mcp_loose_ends_dir() -> PathBuf {
     let base = if let Some(p) = std::env::var_os("HYPERHIVE_HARNESS_DIR") {