fix(cli): honored dry-run in plugin uninstall

handleUninstall dropped the parsed dryRun flag and unconditionally called
mktMgr.uninstallPlugin / manager.uninstall, so `omp plugin uninstall
<plugin> --dry-run` removed the plugin on both the marketplace and npm
routes. Propagate dryRun into handleUninstall and short-circuit before
both removal calls, reporting the resolved removal (with its source)
instead of mutating state.

Fixes #8178

packages/coding-agent/src/cli/plugin-cli.ts

@@ -464,7 +464,7 @@ async function handleInstall(
 async function handleUninstall(
 	manager: PluginManager,
 	packages: string[],
-	flags: { json?: boolean; scope?: "user" | "project" },
+	flags: { json?: boolean; dryRun?: boolean; scope?: "user" | "project" },
 ): Promise<void> {
 	if (packages.length === 0) {
 		console.error(chalk.red(`Usage: ${APP_NAME} plugin uninstall <package> ...`));
@@ -477,7 +477,26 @@ async function handleUninstall(
 	const installedPlugins = new Set((await mktMgr.listInstalledPlugins()).map(p => p.id));
 
 	for (const name of packages) {
-		if (installedPlugins.has(name)) {
+		const viaMarketplace = installedPlugins.has(name);
+
+		if (flags.dryRun) {
+			// Dry-run is non-mutating: report the resolved removal without touching state.
+			if (flags.json) {
+				console.log(
+					JSON.stringify({
+						dryRun: true,
+						action: "uninstall",
+						plugin: name,
+						source: viaMarketplace ? "marketplace" : "npm",
+					}),
+				);
+			} else {
+				console.log(chalk.dim(`[dry-run] Would uninstall ${name}`));
+			}
+			continue;
+		}
+
+		if (viaMarketplace) {
 			// Exact match against installed marketplace plugin IDs (name@marketplace)
 			try {
 				await mktMgr.uninstallPlugin(name, flags.scope);