Initial pre-release

tmux-party: share a tmux session with people on the same UNIX host.
Single-file POSIX shell (party) with a filesystem + tmux server-access
trust model. See README.md.

tests/40-perms.bats

@@ -0,0 +1,29 @@
+#!/usr/bin/env bats
+
+load 'helpers'
+
+setup() {
+  setup_party_sandbox
+  load_party_lib
+}
+
+@test "apply_party_perms_file sets mode g+rw on a regular file" {
+  require_party_group
+  f="$PARTY_TMP/f"
+  : > "$f"
+  apply_party_perms_file "$f"
+  m=$(stat -c '%a' "$f" 2>/dev/null || stat -f '%Lp' "$f")
+  case "$m" in
+    *6[0-9])  ;;   # group has rw
+    *) echo "mode=$m"; false ;;
+  esac
+  g=$(stat -c '%G' "$f" 2>/dev/null || stat -f '%Sg' "$f")
+  [ "$g" = "$TMUX_PARTY_GROUP" ]
+}
+
+@test "validate_socket_dir_parent accepts an owner-only-writable parent" {
+  # PARTY_SOCKET_DIR is the per-party dir's parent. Created at mode 0700
+  # by setup_party_sandbox (owner-only, neither group- nor world-writable),
+  # which validate_socket_dir_parent should accept without complaint.
+  validate_socket_dir_parent
+}