atuin-pick: run selection in interactive fish via --init-command

dot_local/bin/executable_atuin-pick

@@ -3,14 +3,14 @@
 
 atuin search -i draws its TUI on the tty and prints the selected command
 to stdout (Esc prints nothing). Filter to history from the current
-directory. Run the selection with rc loaded so aliases and functions
-resolve — its output stays in this split — then drop to an interactive
-shell.
+directory. Hand the selection to an interactive fish via --init-command:
+it runs inside that shell (aliases/abbr resolve, cd persists) with its
+output in the split, and the prompt drops down below it.
 """
 import os
+import shlex
 import shutil
 import subprocess
-import sys
 
 # kitty's launch env has neither ~/.atuin/bin on PATH nor ATUIN_SESSION
 # (atuin's shell init never ran), so resolve and seed both here.
@@ -25,7 +25,8 @@ sel = subprocess.run(
     stdout=subprocess.PIPE,
     text=True,
 ).stdout.strip()
+
+argv = ["fish"]
 if sel:
-    print(f"\u276f {sel}", file=sys.stderr)
-    subprocess.run(["zsh", "-ic", "--", sel])
-os.execvp("zsh", ["zsh", "-i"])
+    argv += ["-C", f"echo {shlex.quote('\u276f ' + sel)}; {sel}"]
+os.execvp("fish", argv)