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-ag3nt/src/mcp_loose_ends.rs

@@ -10,6 +10,9 @@
 
 use std::path::PathBuf;
 
+/// NOTE: the base-dir resolution logic here is intentionally mirrored in
+/// `hive-bash-mcp/src/paths.rs::mcp_loose_ends_dir()`. They can't share
+/// code across crates — keep them in sync if the fallback logic changes.
 fn loose_ends_dir() -> PathBuf {
     let base = if let Some(p) = std::env::var_os("HYPERHIVE_HARNESS_DIR") {
         PathBuf::from(p)