Fix agentpipe-bin install (binary name in release tarball)

pkgs/agentpipe-bin.nix

@@ -20,23 +20,31 @@ unpackPhase = ''
 installPhase = ''
   mkdir -p "$out/bin"
 
-  bin=""
-  if [ -f "./agentpipe" ]; then
-    bin="./agentpipe"
-  else
-    bin="$(find . -maxdepth 3 -type f -name agentpipe -print -quit)"
+  if [ -f ./agentpipe ]; then
+    install -m0755 ./agentpipe "$out/bin/agentpipe"
+    exit 0
   fi
 
+  if [ -f ./agentpipe_linux_amd64 ]; then
+    install -m0755 ./agentpipe_linux_amd64 "$out/bin/agentpipe"
+    exit 0
+  fi
+
+  # Fallback: try to locate it if the archive layout changes.
+  bin="$(find . -maxdepth 5 -type f \
+    \( -name agentpipe -o -name 'agentpipe_linux_amd64' -o -name 'agentpipe_*' \) \
+    ! -name env-vars \
+    -print -quit)"
+
   if [ -z "$bin" ]; then
     echo "agentpipe binary not found after unpack. Contents:" >&2
-    find . -maxdepth 3 -type f -print >&2
+    find . -maxdepth 5 -print >&2
     exit 1
   fi
 
   install -m0755 "$bin" "$out/bin/agentpipe"
 '';
 
-
   meta = with lib; {
     description = "AgentPipe multi-agent orchestrator CLI/TUI";
     homepage = "https://github.com/kevinelliott/agentpipe";