test(coding-agent): adapted plugin-install and loader-accent tests to landed behavior changes

- plugin-install-validation mocks now answer the bun pm cache probe that refreshBunGitCache issues before bun update on git re-installs.
- working-accent tests render the loader before asserting accent computation counts: colorizers run lazily at render time since the loader layout cache landed.

packages/coding-agent/test/plugin-install-validation.test.ts

@@ -15,6 +15,25 @@ function emptyStream(): ReadableStream<Uint8Array> {
 	return body;
 }
 
+/**
+ * Mock response for the `bun pm cache` probe the manager runs before a git
+ * re-install (refreshBunGitCache). Points at a nonexistent directory so the
+ * cache refresh is a no-op.
+ */
+function pmCacheSubprocess(tmpRoot: string, cmd: string[]): Subprocess {
+	expect(cmd).toEqual(["bun", "pm", "cache"]);
+	const body = new Response(path.join(tmpRoot, "no-such-bun-cache")).body;
+	if (!body) {
+		throw new Error("Failed to create response stream");
+	}
+	return {
+		pid: 3,
+		stdout: body,
+		stderr: emptyStream(),
+		exited: Promise.resolve(0),
+	} as Subprocess;
+}
+
 interface PluginFixture {
 	readonly version: string;
 	readonly source: string;
@@ -255,6 +274,7 @@ describe("PluginManager.install load validation", () => {
 					exited: prepare.then(() => 0),
 				} as Subprocess;
 			}
+			if (cmd[1] === "pm") return pmCacheSubprocess(tmpRoot, cmd);
 			// The manager follows a git re-install with `bun update <name>` to refresh
 			// the lockfile pin (#3063). The mock treats it as a no-op exit-0 — the
 			// on-disk state already reflects the v2 install above.
@@ -390,6 +410,7 @@ describe("PluginManager.install load validation", () => {
 					exited: prepare.then(() => 0),
 				} as Subprocess;
 			}
+			if (cmd[1] === "pm") return pmCacheSubprocess(tmpRoot, cmd);
 			expect(cmd).toEqual(["bun", "update", "git-plugin"]);
 			const prepare = (async () => {
 				// bun update re-resolves the ref and rewrites the lockfile pin
@@ -503,6 +524,7 @@ describe("PluginManager.install load validation", () => {
 					exited: prepare.then(() => 0),
 				} as Subprocess;
 			}
+			if (cmd[1] === "pm") return pmCacheSubprocess(tmpRoot, cmd);
 			expect(cmd).toEqual(["bun", "update", "git-plugin"]);
 			const prepare = (async () => {
 				await Bun.write(bunLockPath, '# bun.lock\n"git-plugin": "github:org/plugin#sha-update"\n');