Read personal dev settings from git-ignored local config

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/devenv.sh

@@ -0,0 +1,13 @@
+# Personal settings of the dev tools: local/dev.env (git-ignored; template tools/dev.env.example).
+# Sourced by the shell scripts in tools/; a variable already set in the environment wins over the file.
+_devenv_load() {
+  local f k v
+  f="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)/local/dev.env"
+  [ -f "$f" ] || return 0
+  while IFS='=' read -r k v || [ -n "$k" ]; do
+    case $k in '' | \#*) continue ;; esac
+    [ -n "${!k+x}" ] || export "$k=$v"
+  done <"$f"
+}
+_devenv_load
+unset -f _devenv_load