Build the Apple Container extension

Turns the empty scaffold into a working Nova extension for Apple Container
and container-compose, in the shape of the Docker Suite extension.

Sidebar (Scripts/Sidebar):
- System, Containers, Images, Volumes and Networks sections
- Containers grouped into compose projects via the com.docker.compose.project
  label container-compose stamps; project rows drive compose up/down/build
  against the matching workspace file
- Lifecycle, shell, logs, inspect, browse and copy commands per resource
- Apple Container publishes no event stream, so the sidebar polls while
  visible and only reloads a section when a fingerprint of its data changes,
  which keeps selection and expansion intact

Hostnames (Scripts/Hostnames.js):
- A container's hostname is <name>.<domain> and the domain lives in Apple
  Container's config.toml, which has no CLI setter, so the Hostname Domain
  preference reads and writes that file directly
- Changing it offers to register the domain with macOS and restart the
  services; the write preserves the file's other tables and its mode

Language support:
- Dockerfile and Compose syntaxes backed by tree-sitter grammars built by
  Tools/build-syntaxes.sh, pinned to revisions that generate ABI 14
- The Compose syntax is named dockercompose because that is the languageId
  docker-language-server recognises compose files by
- docker-language-server is downloaded on first use rather than bundled, at
  roughly 40 MB

Icons are generated by Tools/make-icons.py so they can be regenerated rather
than hand-maintained.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UnSBcR5Lywz5Fbj5FmVbfc

Scripts/main.js

@@ -0,0 +1,73 @@
+//
+// Apple Container for Nova.
+//
+// Entry point: wires up the sidebar, the extension's commands and the Docker
+// language server, and tears them all down again on deactivate.
+//
+
+const { ContainerSidebar } = require("./Sidebar/ContainerSidebar");
+const { Hostnames } = require("./Hostnames");
+const { DockerLanguageClient } = require("./LanguageClients/DockerLanguageClient");
+const { ContainerCLI } = require("./Interfaces/ContainerCLI");
+const { Commands } = require("./Commands");
+const notify = require("./Utilities/Notify");
+
+let sidebar = null;
+let languageClient = null;
+let commands = null;
+let hostnames = null;
+
+exports.activate = async function () {
+	commands = new Commands({
+		sidebar: () => sidebar,
+		restartLanguageServer: () => (languageClient ? languageClient.restart() : null)
+	});
+
+	if (!(await installed())) {
+		notify.configFailure(
+			"Apple Container was not found",
+			"Install it from github.com/apple/container, or set the path to the container tool in the extension's preferences.",
+			"apple-container-missing"
+		);
+	} else {
+		sidebar = new ContainerSidebar();
+		hostnames = new Hostnames({
+			reload: () => (sidebar ? sidebar.reload() : null)
+		});
+	}
+
+	languageClient = new DockerLanguageClient();
+	await languageClient.start();
+};
+
+exports.deactivate = function () {
+	if (sidebar) {
+		sidebar.dispose();
+		sidebar = null;
+	}
+
+	if (languageClient) {
+		languageClient.dispose();
+		languageClient = null;
+	}
+
+	if (hostnames) {
+		hostnames.dispose();
+		hostnames = null;
+	}
+
+	if (commands) {
+		commands.dispose();
+		commands = null;
+	}
+};
+
+// The CLI is the one hard requirement: without it there is nothing to show.
+async function installed() {
+	try {
+		await ContainerCLI.version();
+		return true;
+	} catch (error) {
+		return false;
+	}
+}