ZSH: Add completions directory, fix fpath order, use complete-word

Add ~/.config/zsh/completions/ as a chezmoi-managed fpath directory
for static completion files. Move chezmoi completion there and keep
only the alias binding in the sourced file. Fix linuxbrew fpath
additions to happen before compinit. Switch Tab from menu-complete
to complete-word to avoid unexpected expansion of globs and variables.

Author: jdevera

home/dot_config/zsh/completions/_chezmoi.tmpl

@@ -0,0 +1 @@
+{{ completion "zsh" }}

home/dot_config/zsh/exact_private_zsh.d/private_050_completion.zsh

@@ -1,7 +1,18 @@
 # ZSH completion system {{{
 # ---------------------------------------------------------------------------
 
-# Initialize the completion system
+# Custom completions directory managed by chezmoi
+fpath=(~/.config/zsh/completions $fpath)
+
+# Load all completions from linuxbrew
+if [[ -d /home/linuxbrew/.linuxbrew/share/zsh/site-functions ]]; then
+    fpath=(/home/linuxbrew/.linuxbrew/share/zsh/site-functions $fpath)
+fi
+if [[ -d ~/.linuxbrew/share/zsh/site-functions ]]; then
+    fpath=(~/.linuxbrew/share/zsh/site-functions $fpath)
+fi
+
+# Initialize the completion system (must be after fpath additions)
 autoload -Uz compinit && compinit
 
 # Git completion for aliases (must be after compinit)
@@ -42,14 +53,3 @@ function __complete_new()
 compdef __complete_new new
 # ---------------------------------------------------------------------------
 # }}}
-# Load all completions from linuxbrew {{{
-# ---------------------------------------------------------------------------
-if [[ -d /home/linuxbrew/.linuxbrew/share/zsh/site-functions ]]; then
-    fpath=(/home/linuxbrew/.linuxbrew/share/zsh/site-functions $fpath)
-fi
-if [[ -d ~/.linuxbrew/share/zsh/site-functions ]]; then
-    fpath=(~/.linuxbrew/share/zsh/site-functions $fpath)
-fi
-
-# ---------------------------------------------------------------------------
-# }}}

home/dot_config/zsh/exact_private_zsh.d/private_050_misc_config.zsh

@@ -264,8 +264,10 @@ setopt NO_NOMATCH
 # Use emacs key bindings (same as bash default)
 bindkey -e
 
-# Cycle through available completions with Tab
-bindkey '^I' menu-complete
+# Use complete-word instead of the default expand-or-complete. This skips
+# expansion (globs, aliases, variables) and jumps straight to completion,
+# avoiding unexpected substitutions like $PWD expanding into a full path.
+bindkey '^I' complete-word
 
 # Cycle in reverse with Shift-Tab
 bindkey '^[[Z' reverse-menu-complete

home/dot_config/zsh/exact_private_zsh.d/private_100_complete_chezmoi.zsh

@@ -0,0 +1,4 @@
+# Chezmoi completion is loaded from ~/.config/zsh/completions/_chezmoi
+
+alias erchoso=chezmoi
+compdef _chezmoi erchoso