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/.chezmoitemplates/scripts/commonrc.fish.tmpl

@@ -0,0 +1,89 @@
+# Fish shell common configuration
+# This template provides environment setup for Fish shell
+
+# General configuration
+set -gx EDITOR "micro"
+set -gx GPG_TTY (tty)
+set -gx MICRO_TRUECOLOR 1
+set -gx TERM xterm-256color  # fixes terminal colors when ssh'ing into laptop
+
+# Authentication
+set -gx OPENAI_API_KEY "{{ dopplerProjectJson.OPENAI_CHATGPT_CLI }}"
+
+# hishtory (lazy-loaded via __init_hishtory function)
+test -d $HOME/.hishtory && fish_add_path $HOME/.hishtory
+
+# PATH setup
+test -d $HOME/bin && fish_add_path $HOME/bin
+fish_add_path /usr/local/bin
+fish_add_path $HOME/.local/bin
+test -d /usr/local/go/bin && fish_add_path /usr/local/go/bin  # Go
+test -d $HOME/go/bin && fish_add_path $HOME/go/bin  # Go-installed tools
+test -d $HOME/.local/share/bob/nvim-bin && fish_add_path $HOME/.local/share/bob/nvim-bin  # Bob, Neovim package manager
+
+# Deno
+if test -d $HOME/.deno
+    source $HOME/.deno/env.fish 2>/dev/null || set -gx DENO_INSTALL $HOME/.deno && fish_add_path $DENO_INSTALL/bin
+end
+
+# Rust (Cargo)
+if test -f $HOME/.cargo/env.fish
+    source $HOME/.cargo/env.fish
+else if test -f $HOME/.cargo/env
+    # Fallback: parse bash env file
+    set -gx CARGO_HOME $HOME/.cargo
+    fish_add_path $CARGO_HOME/bin
+end
+
+# Homebrew
+if test -f /home/linuxbrew/.linuxbrew/bin/brew
+    eval (/home/linuxbrew/.linuxbrew/bin/brew shellenv)
+end
+
+set -gx PYENV_ROOT $HOME/.pyenv
+
+# bun
+set -gx BUN_INSTALL $HOME/.bun
+fish_add_path $BUN_INSTALL/bin
+# Note: Bun's _bun file is bash-specific, Fish completions handled separately
+
+# jenv (Java version manager)
+if test -d $HOME/.jenv/bin
+    fish_add_path $HOME/.jenv/bin
+    if command -q jenv
+        jenv init - fish | source
+    end
+end
+
+# pnpm
+set -gx PNPM_HOME $HOME/.local/share/pnpm
+if not contains $PNPM_HOME $PATH
+    fish_add_path $PNPM_HOME
+end
+
+# spicetify
+if test -d $HOME/.spicetify
+    fish_add_path $HOME/.spicetify
+end
+
+# pulumi
+if test -d $HOME/.pulumi/bin
+    fish_add_path $HOME/.pulumi/bin
+end
+
+# dotnet
+if test -d $HOME/.dotnet
+    set -gx DOTNET_ROOT $HOME/.dotnet
+    fish_add_path $DOTNET_ROOT
+    fish_add_path $DOTNET_ROOT/tools
+end
+
+# Note: Aliases are defined in Fish-native format in ~/.config/fish/conf.d/abbr.fish
+# The bash_aliases file contains bash-specific syntax and is not sourced here
+
+{{- /* WSL-specific settings */ -}}
+{{- if .data.wsl }}
+
+## Ensures CLI apps open URLs in the default Windows browser
+set -gx BROWSER 'powershell.exe /c start'
+{{- end }}

home/.chezmoitemplates/scripts/commonrc.sh.tmpl

@@ -1,4 +1,4 @@
-# This template's argument is the shell as a string (bash, zsh).
+# This template's argument is the shell as a string (bash, ...).
 
 # general configuration
 export EDITOR="micro"
@@ -13,9 +13,7 @@ export OPENAI_API_KEY="{{ dopplerProjectJson.OPENAI_CHATGPT_CLI }}"
 # hishtory
 export HISHTORY_SERVER="https://hsh.{{ dopplerProjectJson.PRIVATE_DOMAIN }}"
 export PATH="$PATH:$HOME/.hishtory"
-{{ if eq .shell "zsh" -}}
-source $HOME/.hishtory/config.zsh
-{{ else if eq .shell "bash" -}}
+{{ if eq .shell "bash" -}}
 source $HOME/.hishtory/config.sh
 {{- else -}}
 {{ fail "Unexpected shell." }}
@@ -63,19 +61,6 @@ if [ -d $HOME/.jenv/bin ]; then
 	fi
 fi
 
-if command -v hass-cli &> /dev/null; then
-  export HASS_SERVER={{ dopplerProjectJson.HASS_SERVER_URL }}
-  export HASS_TOKEN={{ dopplerProjectJson.HASS_SERVER_TOKEN }}
-  
-  {{ if eq .shell "bash" -}}
-  source <(_HASS_CLI_COMPLETE=bash_source hass-cli)
-  {{ else if eq .shell "zsh" -}}
-  source <(_HASS_CLI_COMPLETE=zsh_source hass-cli)
-  {{ else if eq .shell "fish" -}}
-  eval (_HASS_CLI_COMPLETE=fish_source hass-cli)
-  {{ end }}
-fi
-
 # pnpm
 export PNPM_HOME="$HOME/.local/share/pnpm"
 case ":$PATH:" in
@@ -93,7 +78,6 @@ if [ -d "$HOME/.pulumi/bin" ]; then
     export PATH=$PATH:$HOME/.pulumi/bin
 fi
 
-# load aliases (note: omz aliases are supposed to be placed in ZSH_CUSTOM?)
 . $HOME/.bash_aliases
 
 
@@ -108,14 +92,4 @@ export BROWSER='powershell.exe /c start'
 if [ -d "$HOME/.dotnet" ]; then
   export DOTNET_ROOT="$HOME/.dotnet"
   export PATH="$PATH:$DOTNET_ROOT:$DOTNET_ROOT/tools"
-fi
-
-# disable screen blanking
-# source $(brew --prefix)/share/zsh/site-functions/_todoist_peco
-# xset s off && xset -dpms
-# Preferred editor for local and remote sessions
-# if [[ -n $SSH_CONNECTION ]]; then
-#   export EDITOR='micro'
-# else
-#   export EDITOR='nvim'
-# fi
+fi