chore: update bin scripts — rename references from .sh to plain names

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bin/README.md

@@ -2,7 +2,7 @@
 
 Personal shell scripts, available system-wide via `~/scripts` in `PATH`.
 
-## stacks.sh
+## stacks
 
 Docker Compose stack manager for `~/stacks`. Set `STACKS_DIR` to override the default location.
 
@@ -60,7 +60,7 @@ stacks completion zsh --static --install  # static (bakes current list in)
 
 **Global flags:** `--dry-run`, `--parallel`, `--verbose`, `--quiet`
 
-## arty.sh
+## arty
 
 Bash library repository and release management system. Run inside a directory with an `arty.yml`.
 

bin/arty

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# arty.sh - A bash library repository and release management system
+# arty - A bash library repository management system
 # Version: 1.0.0
 
 set -euo pipefail

bin/stacks

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# stacks.sh — Docker Compose stack manager
+# stacks — Docker Compose stack manager
 set -euo pipefail
 
 # ─── Bootstrap ────────────────────────────────────────────────────────────────