feat(pitchfork): add pitchfork plugin

plugins/pitchfork/README.md

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+# pitchfork
+
+Adds integration with [pitchfork](https://github.com/jdx/pitchfork), a devilishly good process manager for
+developers. Pitchfork manages background daemons and services for local development environments, automatically
+starting and stopping them as you navigate between project directories.
+
+## Installation
+
+1. [Download & install pitchfork](https://github.com/jdx/pitchfork#installation) by running the following:
+
+```bash
+mise use -g pitchfork
+```
+
+Or install via Cargo:
+
+```bash
+cargo install pitchfork-cli
+```
+
+2. [Enable pitchfork](https://pitchfork.jdx.dev) by adding it to your `plugins` definition in `~/.zshrc`.
+
+```bash
+plugins=(pitchfork)
+```
+
+## Usage
+
+See the [pitchfork docs](https://pitchfork.jdx.dev) for full information. Here are a few examples:
+
+```bash
+pitchfork start --all     Start all configured daemons
+pitchfork stop            Stop running daemons
+pitchfork status          Show status of all daemons
+pitchfork logs [name]     View logs for a daemon
+pitchfork tui             Open the terminal dashboard
+```
+
+The plugin loads pitchfork's shell hook (`pitchfork activate zsh`), which automatically starts and stops
+daemons when you enter or leave a project directory, and sets up zsh tab-completions.

plugins/pitchfork/pitchfork.plugin.zsh

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+if (( ! $+commands[pitchfork] )); then
+  return
+fi
+
+# Load pitchfork hooks
+eval "$(pitchfork activate zsh)"
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `pitchfork`. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_pitchfork" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _pitchfork
+  _comps[pitchfork]=_pitchfork
+fi
+
+# Generate and load pitchfork completion
+pitchfork completion zsh >| "$ZSH_CACHE_DIR/completions/_pitchfork" &|