refactor(#1450): lift shared harness-path resolution into hive-sh4re

hive-ag3nt/src/mcp_loose_ends.rs

@@ -10,20 +10,10 @@
 
 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.
+/// Resolution lives in `hive_sh4re::paths` so the harness + every MCP
+/// daemon agree on where loose-end summary files are written.
 fn loose_ends_dir() -> PathBuf {
-    let base = if let Some(p) = std::env::var_os("HYPERHIVE_HARNESS_DIR") {
-        PathBuf::from(p)
-    } else {
-        let state = std::env::var("HYPERHIVE_STATE_DIR").unwrap_or_default();
-        let state_path = PathBuf::from(&state);
-        state_path
-            .parent()
-            .map_or_else(|| PathBuf::from(state), |p| p.join("harness"))
-    };
-    base.join("mcp-loose-ends")
+    hive_sh4re::paths::mcp_loose_ends_dir()
 }
 
 /// Collect all loose-end summary strings published by external MCP daemons.