feat: remove difft

CLAUDE.md

@@ -33,12 +33,12 @@ There is no build, lint, or test suite — this is a config repo. "Testing" a ch
 
 ## Architecture
 
-- **`run_onchange_before_NN_*.sh`** — idempotent setup scripts chezmoi re-runs whenever their content hash changes, in numeric order (`0` installs apt packages, `1` sets zsh as default shell and installs antidote, `20`+ install individual tools: fzf, diff-so-fancy, vim-plug, tmux plugin manager, lazygit, fonts, difftastic, nbdime). New machine-setup steps should follow this pattern: a numbered `run_onchange_before_*.sh` with `set -euo pipefail` and an existence check so re-runs are no-ops.
+- **`run_onchange_before_NN_*.sh`** — idempotent setup scripts chezmoi re-runs whenever their content hash changes, in numeric order (`0` installs apt packages, `1` sets zsh as default shell and installs antidote, `20`+ install individual tools: fzf, diff-so-fancy, vim-plug, tmux plugin manager, lazygit, fonts, nbdime). New machine-setup steps should follow this pattern: a numbered `run_onchange_before_*.sh` with `set -euo pipefail` and an existence check so re-runs are no-ops.
 - **`.chezmoi.toml.tmpl`** — chezmoi's own config template; prompts once for `github_email` and enables `autoCommit`/`autoPush` on `chezmoi apply` (so applying on a configured machine also commits/pushes to this repo — be aware of that when testing changes there).
 - **`.commit_message.tmpl`** — template chezmoi uses to prompt for the commit message when autoCommit fires.
 - **Shell startup chain**: `dot_zshrc` sources `bin/term-background` (must run before the p10k instant-prompt block, since it reads the tty for OSC 11 background detection) → p10k instant prompt → `~/.environment`(`dot_environment`) + optional `~/.environment.local` → `~/.aliases` (`dot_aliases`) + optional `~/.aliases.local` → antidote plugin load (plugin list in `dot_zsh_plugins.txt`) → `~/.p10k.zsh`. The `.local` files are gitignored, host-specific overrides — never add machine-specific values directly to the tracked files.
-- **`dot_gitconfig.tmpl`** — templated on `.github_email`; wires up diff-so-fancy/difftastic as pagers and nbdime for Jupyter notebook diffing. `~/.gitconfig.local` (untracked) is included for machine-specific overrides.
+- **`dot_gitconfig.tmpl`** — templated on `.github_email`; wires up diff-so-fancy as the pager and nbdime for Jupyter notebook diffing. `~/.gitconfig.local` (untracked) is included for machine-specific overrides.
 - **`private_dot_config/`** → installs to `~/.config/` with restrictive permissions (nvim, matplotlib styles, fontconfig).
 - **`bin/`** → installs to `~/bin/`; `executable_term-background` detects terminal light/dark background via OSC 11 for theme-matching in nvim etc.
-- **`.chezmoiignore`** lists source-repo-only paths (`README.md`, `.claude`, `.codex`, `.agents`) that chezmoi should never install to `$HOME`, plus a `machineClass`-gated conditional excluding `.ssh/config.d/home` and `.ssh/config.d/web` on any machine that isn't `machineClass = "private"`.
+- **`.chezmoiignore`** lists source-repo-only paths (`README.md`, `.codex`, `.agents`, `CLAUDE.md`, `CLAUDE.local.md`, `key.txt.age`) that chezmoi should never install to `$HOME`, plus a `machineClass`-gated conditional excluding `.ssh/config.d/home`, `.ssh/config.d/web`, and `.claude/settings.json` on any machine that isn't `machineClass = "private"` — `~/.claude/settings.json` has no user-level `.local.json` merge mechanism, so machines with differing Claude Code config (e.g. `enabledPlugins`) manage that file by hand instead of via chezmoi.
 - **Age encryption**: `key.txt.age` (repo root) is an age private key encrypted with a passphrase.`run_onchange_before_02_decrypt-age-key.sh.tmpl` decrypts it into `~/.config/chezmoi/key.txt`.

dot_gitconfig.tmpl

@@ -5,7 +5,6 @@
     email = {{ .github_email | quote }}
 [core]
     pager = sh -c 'command -v diff-so-fancy >/dev/null && exec diff-so-fancy || less --tabs=4 -RX'
-    pager = less
 	autocrlf = input
 	attributesFile = {{ .chezmoi.homeDir }}/.gitattributes
 [alias]
@@ -35,7 +34,6 @@
 [diff]
 	noprefix = true
     colorMoved = True
-    external = difft
 [commit]
 	verbose = true
 [color "status"]

run_onchange_before_26_difftastic.sh

@@ -1,23 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-INSTALL_DIR="${HOME}/.local/bin"
-BINARY_NAME="difft"
-TARBALL="difft-x86_64-unknown-linux-gnu.tar.gz"
-DOWNLOAD_URL="https://github.com/Wilfred/difftastic/releases/latest/download/${TARBALL}"
-
-echo "Downloading difftastic..."
-wget -q --show-progress -O "/tmp/${TARBALL}" "${DOWNLOAD_URL}"
-
-echo "Extracting..."
-tar -xzf "/tmp/${TARBALL}" -C /tmp
-
-echo "Installing to ${INSTALL_DIR}..."
-mv "/tmp/${BINARY_NAME}" "${INSTALL_DIR}/${BINARY_NAME}"
-chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
-
-echo "Cleaning up..."
-rm -f "/tmp/${TARBALL}"
-
-echo "difftastic installed successfully!"
-difft --version