Shell hygiene: simpler reload, pyenv shim cleanup, ignore rules

- zshrc-dev: reload now execs a fresh zsh instead of re-sourcing
- zshenv: remove stale pyenv-rehash temp shim (>1min old) before init
- gitignore_global: ignore .claude/settings.local.json
- zshrc-natera: drop the git switch main->master wrapper

gitignore_global

@@ -1,2 +1,4 @@
 *~
 .DS_Store
+
+**/.claude/settings.local.json

zshenv

@@ -21,5 +21,8 @@ fi
 if command -v pyenv 1>/dev/null 2>&1; then
   export PYENV_ROOT="$HOME/.pyenv"
   export PATH="$PYENV_ROOT/bin:$PATH"
+  # Clear a stale rehash temp file left behind by a killed pyenv-rehash.
+  # A real rehash completes in well under a second; anything older than a minute is stale.
+  find "$PYENV_ROOT/shims/.pyenv-shim" -mmin +1 -delete 2>/dev/null
   eval "$(pyenv init -)"
 fi

zshrc-dev

@@ -509,7 +509,7 @@ alias topcmd="history | awk '{print \$2}' | sort | uniq -c | sort -rn | head -10
 # ============================================================================
 
 alias code='cursor .'
-alias reload='source ~/.zshrc && echo "✅ Shell configuration reloaded"'
+alias reload='exec zsh'
 alias editrc='cursor ~/dotfiles/zshrc'
 alias editdev='cursor ~/dotfiles/zshrc-dev'
 alias c='clear'

zshrc-natera

@@ -97,15 +97,6 @@ kb-publish() {
   echo "Site published."
 }
 
-# Natera repos use master as primary; rewrite "git switch main" to "git switch master"
-git() {
-  if [[ "$1" == "switch" && "${2:-}" == "main" ]]; then
-    command git switch master "${@:3}"
-  else
-    command git "$@"
-  fi
-}
-
 # Sensitive values (AWS profile, OTEL endpoint, cert paths, refresh alias) are in zshrc-natera.private
 # Copy zshrc-natera.private.example to zshrc-natera.private and fill in. That file is gitignored.
 [[ -f ~/dotfiles/zshrc-natera.private ]] && source ~/dotfiles/zshrc-natera.private