build: add initial zig package

README.md

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+```
+     _   _ _       _     _     _       _     _       _         
+    | \ | (_)     | |   | |   | \     / |   | |     | |        
+    |  \| |_  __ _| |__ | |_  \  \ _ /  /_ _| |_  __| |___     
+    | . ` | |/ _` | '_ \| __|  \  ` '  / _` | __|/ _| '_  \    
+    | |\  | | (_| | | | | |_    \     / (_| | |_| (_| | | |    
+    |_| \_|_|\__, |_| |_|\__|    \_|_/ \__,_|\__|\__|_| |_|    
+              __/ |                                            
+             |___/                                             
+                   T H E   N I G H T   W A T C H               
+```
+![nightwatch](docs/nightwatch.png)
+
+> The city sleeps.
+> The files do not.
+
+"FABRICATI DIEM, PVNC"
+
+**The Night Watch** is a file change tracker for directory trees, written
+in **Zig**.
+
+It provides:
+
+- A standalone CLI for tracking filesystem changes
+- A module for embedding change-tracking into other Zig programs
+- Minimal dependencies and consistent, predictable, cross-platform behavior
+
+It does not interfere.
+It does not speculate.
+It simply keeps watch.
+
+------------------------------------------------------------------------
+
+## Features
+
+- Recursive directory tree tracking
+- Deterministic multi-platform support (Linux, FreeBSD, MacOS, Windows)
+- Lightweight and fast
+- Embeddable Zig module API
+- Standalone CLI executable
+
+------------------------------------------------------------------------
+
+# Installation
+
+The Watch is written in **Zig** and built using the Zig build system.
+
+## Requirements
+
+- Zig (currently zig-0.15.2)
+
+## Build CLI
+
+``` bash
+zig build
+```
+
+The executable will be located in:
+
+`zig-out/bin/nightwatch`
+
+## Install System-Wide
+
+``` bash
+zig build install
+```
+
+------------------------------------------------------------------------
+
+# Using as a Zig Module
+
+The Night Watch exposes a reusable module that can be imported into
+other Zig programs.
+
+In your `build.zig`:
+
+``` zig
+const nightwatch = b.dependency("nightwatch", .{
+    .target = target,
+    .optimize = optimize,
+});
+
+exe.root_module.addImport("nightwatch", nightwatch.module("nightwatch"));
+```
+
+In your Zig source:
+
+``` zig
+const nightwatch = @import("nightwatch");
+```
+
+You now have programmatic access to the tracking engine.
+
+------------------------------------------------------------------------
+
+# CLI Usage
+
+``` bash
+nightwatch [{path}..]
+```
+
+Run:
+
+``` bash
+nightwatch --help
+```
+
+for full command documentation.
+
+------------------------------------------------------------------------
+
+# Philosophy
+
+Other tools watch files.
+
+The Night Watch keeps watch over the peace.
+
+It remembers what changed.
+It records what vanished.
+It notices what arrived at 2:14 AM.
+
+And it writes it down.