fix(shell): clean up rcfiles and remove redundancies

- Remove deprecated GREP_OPTIONS (handled via alias)
- Quote $ZSH_COMPDUMP to prevent word splitting
- Remove duplicate vim alias (nvim alias takes precedence)
- Consolidate completion path to ZSH_CUSTOM_COMPLETION_PATH
- Simplify PATH setup in rcfiles, centralize in exports
- Move LM Studio PATH from rcfiles to exports
- Add clarifying comments for macOS-specific ssh-add

base/zshrc

@@ -7,18 +7,13 @@
 autoload -U promptinit; promptinit
 
 export DOTFILES="$HOME/.dotfiles"
-LOCAL_SHARE="$HOME/.local/share"
-export PATH="$HOME/.local/bin:$DOTFILES/local/bin:$LOCAL_SHARE/nvim/mason/bin:$LOCAL_SHARE/bob/nvim-bin:$LOCAL_SHARE/cargo/bin:/opt/homebrew/bin:/usr/local/bin:$PATH"
+# Minimal PATH for x-have and utilities; full PATH set in shared.sh/exports
+export PATH="$HOME/.local/bin:$DOTFILES/local/bin:$PATH"
 export SHARED_SCRIPTS_SOURCED=0
 
 source "$DOTFILES/config/shared.sh"
 
-# zsh completions directory
-[ -z "$ZSH_COMPLETIONS" ] && export ZSH_COMPLETIONS="$XDG_CONFIG_HOME/zsh/completion"
-
-# Add zsh completions to FPATH, compinit will be called later
-FPATH="$ZSH_COMPLETIONS:$FPATH"
-
+# zsh completions directory (ZSH_CUSTOM_COMPLETION_PATH set in shared.sh)
 ZSH_COMPDUMP="$XDG_CACHE_HOME/zsh/zcompdump-${SHORT_HOST}-${ZSH_VERSION}"
 
 source "$DOTFILES/config/zsh/antidote.zsh"
@@ -37,12 +32,10 @@ source_fzf_config
 x-have antidot && eval "$(antidot init)"
 
 autoload -Uz compinit bashcompinit
-compinit -d $ZSH_COMPDUMP
+compinit -d "$ZSH_COMPDUMP"
 bashcompinit
 
 # To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
 export P10K_CONFIG="$DOTFILES/config/zsh/p10k.zsh"
 [[ ! -f "$P10K_CONFIG" ]] || source "$P10K_CONFIG"
 
-# Added by LM Studio CLI (lms)
-export PATH="$PATH:$HOME/.lmstudio/bin"