feat: migrate from Zsh to Fish shell with comprehensive configuration

Major shell migration replacing Zsh/Oh-My-Zsh with Fish shell:

- Remove all Zsh configurations (dot_zshrc.tmpl, dot_p10k.zsh)
- Remove Oh-My-Zsh external dependencies from .chezmoiexternal.toml
- Add complete Fish shell setup with config.fish.tmpl and abbr.fish.tmpl
- Implement Fish-native functions for lazy-loading tools (mise, pyenv, zoxide, etc.)
- Create commonrc.fish.tmpl for cross-shell compatibility
- Add Fish plugin management via Fisher (tide prompt, fzf.fish)
- Update documentation (CLAUDE.md, TODO.md, ONBOARDING.md) to reflect Fish
- Add .fish.tmpl file association to VS Code settings
- Enhance PowerShell profile with lsd aliases
- Configure git delta pager and zdiff3 merge conflict style
- Update WSL keychain integration for Fish shell

This migration maintains all existing tool integrations while improving
startup performance through lazy-loading and Fish's native features.

home/dot_config/fish/functions/__init_hishtory.fish.tmpl

@@ -0,0 +1,12 @@
+# Defer hishtory initialization to first prompt
+# This runs after startup but before user interaction
+function __init_hishtory --on-event fish_prompt
+    # Remove this function after first run
+    functions --erase __init_hishtory
+
+    # Only initialize if hishtory config exists
+    if test -f $HOME/.hishtory/config.fish
+        set -gx HISHTORY_SERVER "https://hsh.{{ dopplerProjectJson.PRIVATE_DOMAIN }}"
+        source $HOME/.hishtory/config.fish
+    end
+end

home/dot_config/fish/functions/chatgpt.fish

@@ -0,0 +1,18 @@
+# Lazy-load chatgpt completions on first use
+function chatgpt --wraps chatgpt
+    # Initialize chatgpt completions only once
+    if not set -q __chatgpt_initialized
+        set -g __chatgpt_initialized 1
+
+        # Generate and source completions
+        if command -q chatgpt
+            command chatgpt --set-completions fish | source
+        else
+            echo "chatgpt is not installed" >&2
+            return 1
+        end
+    end
+
+    # Execute the actual chatgpt command
+    command chatgpt $argv
+end

home/dot_config/fish/functions/chcode.fish

@@ -0,0 +1,24 @@
+function chcode --description "Edit chezmoi files in VS Code"
+    set -gx EDITOR "code --wait"
+
+    # Check if --watch is in arguments
+    set -l has_watch false
+    set -l has_file false
+
+    for arg in $argv
+        if test "$arg" = "--watch"
+            set has_watch true
+        else if not string match -q -- '-*' $arg
+            set has_file true
+        end
+    end
+
+    # If --watch is provided but no file, show error
+    if test $has_watch = true -a $has_file = false
+        echo "--watch requires a file to be provided, directories aren't supported with watch mode"
+        return 1
+    end
+
+    # Execute chezmoi edit with all arguments
+    chezmoi edit $argv
+end

home/dot_config/fish/functions/chfix.fish

@@ -0,0 +1,12 @@
+function chfix --description "chmod +x the last command (if it's a file)"
+    # Get the last command from Fish history
+    set -l last_command (history --max 1 | string trim)
+
+    if test -f "$last_command"
+        chmod +x "$last_command"
+        echo "Made executable: $last_command"
+    else
+        echo "Error: $last_command is not a valid file"
+        return 1
+    end
+end

home/dot_config/fish/functions/chshow.fish.tmpl

@@ -0,0 +1,6 @@
+function chshow --description "Show rendered chezmoi template via fzf"
+    set -l target (find {{ .chezmoi.sourceDir | quote }} -name "*.tmpl" -type f | fzf)
+    if test -n "$target"
+        cat $target | chezmoi execute-template
+    end
+end

home/dot_config/fish/functions/fuck.fish

@@ -0,0 +1,19 @@
+# Lazy-load thefuck on first use
+function fuck --description "Correct your previous console command"
+    # Initialize thefuck only once
+    if not set -q __thefuck_initialized
+        set -g __thefuck_initialized 1
+
+        # Run thefuck alias generation
+        if command -q thefuck
+            thefuck --alias | source
+        else
+            echo "thefuck is not installed" >&2
+            return 1
+        end
+    end
+
+    # Execute the fuck command (which thefuck creates)
+    # After initialization, the actual fuck function will be defined
+    fuck $argv
+end

home/dot_config/fish/functions/gi.fish

@@ -0,0 +1,3 @@
+function gi --description "Generate .gitignore from gitignore.io"
+    curl -sL https://www.toptal.com/developers/gitignore/api/$argv
+end

home/dot_config/fish/functions/glf.fish

@@ -0,0 +1,3 @@
+function glf --description "Git log find by commit message"
+    git log --all --grep="$argv"
+end

home/dot_config/fish/functions/just.fish

@@ -0,0 +1,18 @@
+# Lazy-load just completions on first use
+function just --wraps just
+    # Initialize just completions only once
+    if not set -q __just_initialized
+        set -g __just_initialized 1
+
+        # Generate and source completions
+        if command -q just
+            command just --completions fish | source
+        else
+            echo "just is not installed" >&2
+            return 1
+        end
+    end
+
+    # Execute the actual just command
+    command just $argv
+end

home/dot_config/fish/functions/lastRuns.fish

@@ -0,0 +1,7 @@
+function lastRuns --description "Show last N GitHub Actions runs"
+    set -l runs 10
+    if test (count $argv) -gt 0
+        set runs $argv[1]
+    end
+    gh run list -L $runs --json name,url | jq -c '.[] | [.name, .url] | join(" ")' -r
+end

home/dot_config/fish/functions/mise.fish

@@ -0,0 +1,11 @@
+# Lazy-load mise on first use
+function mise --wraps mise
+    # Initialize mise only once
+    if not set -q __mise_initialized
+        set -g __mise_initialized 1
+        command mise activate fish | source
+    end
+
+    # Execute the actual mise command
+    command mise $argv
+end

home/dot_config/fish/functions/mktouch.fish

@@ -0,0 +1,4 @@
+function mktouch --description "Touch a file while creating parent directories"
+    mkdir -p (dirname $argv[1])
+    touch $argv[1]
+end

home/dot_config/fish/functions/pyenv.fish

@@ -0,0 +1,23 @@
+# Lazy-load pyenv on first use
+function pyenv --wraps pyenv
+    # Initialize pyenv only once
+    if not set -q __pyenv_initialized
+        set -g __pyenv_initialized 1
+
+        # Add to PATH if not already there
+        if test -d $PYENV_ROOT/bin; and not contains $PYENV_ROOT/bin $PATH
+            set -gx PATH $PYENV_ROOT/bin $PATH
+        end
+
+        # Run pyenv init
+        command pyenv init - fish | source
+
+        # pyenv-virtualenv if available
+        if command -q pyenv-virtualenv-init
+            command pyenv virtualenv-init - fish | source
+        end
+    end
+
+    # Execute the actual pyenv command
+    command pyenv $argv
+end

home/dot_config/fish/functions/tempCode.fish

@@ -0,0 +1,13 @@
+function tempCode --description "Create a temporary file and open in VS Code"
+    if test (count $argv) -eq 0
+        echo "Must provide filetype argument (ex: py, .xml, html)"
+        return 1
+    end
+
+    # Remove preceding dot, then re-add to support both '.py' and 'py' as arguments
+    set -l extension (string replace -r '^\.' '' $argv[1])
+    set -l temp_file (mktemp /tmp/XXXXXXXXXXXX_(uuidgen).$extension)
+
+    echo "Temporary $argv[1] file created at $temp_file"
+    code --file-uri "file://$temp_file"
+end

home/dot_config/fish/functions/z.fish

@@ -0,0 +1,18 @@
+# Lazy-load zoxide on first use of z command
+function z --description "zoxide smart cd"
+    # Initialize zoxide only once
+    if not set -q __zoxide_initialized
+        set -g __zoxide_initialized 1
+
+        # Run zoxide init
+        if command -q zoxide
+            zoxide init fish | source
+        else
+            echo "zoxide is not installed" >&2
+            return 1
+        end
+    end
+
+    # Execute the actual z command (defined by zoxide init)
+    __zoxide_z $argv
+end

home/dot_config/fish/functions/zi.fish

@@ -0,0 +1,18 @@
+# Lazy-load zoxide on first use of zi command
+function zi --description "zoxide interactive smart cd"
+    # Initialize zoxide only once (shared flag with z.fish)
+    if not set -q __zoxide_initialized
+        set -g __zoxide_initialized 1
+
+        # Run zoxide init
+        if command -q zoxide
+            zoxide init fish | source
+        else
+            echo "zoxide is not installed" >&2
+            return 1
+        end
+    end
+
+    # Execute the actual zi command (defined by zoxide init)
+    __zoxide_zi $argv
+end