chore: Add license header enforcement to all source files (#112)

* Initial plan

* Add license header enforcement to xtask and mass-add headers to all source files

Co-authored-by: mohamedmansour <68524+mohamedmansour@users.noreply.github.com>

* Fix test isolation for license header tests using unique temp directories

Co-authored-by: mohamedmansour <68524+mohamedmansour@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mohamedmansour <68524+mohamedmansour@users.noreply.github.com>

Author: Copilot

.github/copilot-instructions.md

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 use anyhow::{Context, Result};
 use clap::Args;
 use expand_tilde::expand_tilde;

crates/webui-cli/src/commands/build.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 use clap::Args;
 use std::path::PathBuf;
 pub use webui::CssStrategy;

crates/webui-cli/src/commands/common.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 use anyhow::{Context, Result};
 use clap::Args;
 use expand_tilde::expand_tilde;

crates/webui-cli/src/commands/inspect.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 pub mod build;
 pub mod common;
 pub mod inspect;

crates/webui-cli/src/commands/mod.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer};
 use anyhow::{Context, Result};
 use clap::Args;

crates/webui-cli/src/commands/serve.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 mod commands;
 mod utils;
 

crates/webui-cli/src/main.rs

@@ -1 +1,4 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 pub mod output;

crates/webui-cli/src/utils/mod.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 pub fn header(title: &str) {
     eprintln!(
         "\n  {} {}\n",

crates/webui-cli/src/utils/output.rs

@@ -1,3 +1,6 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
 //! Component discovery cache for avoiding repeated filesystem traversal.
 //!
 //! Caches discovered component data at `~/.webui/cache/components/` and