fix(daemon): handle versioned node@XX Homebrew formulas in Cellar resolution

Address review feedback: versioned Homebrew formulas (node@22, node@20)
use keg-only paths where the stable symlink is at <prefix>/opt/<formula>/bin/node,
not <prefix>/bin/node. Updated resolveStableNodePath to:

1. Try <prefix>/opt/<formula>/bin/node first (works for both default + versioned)
2. Fall back to <prefix>/bin/node for the default "node" formula
3. Return the original Cellar path if neither stable path exists

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/daemon/runtime-paths.test.ts

@@ -144,21 +144,35 @@ describe("resolvePreferredNodePath", () => {
 });
 
 describe("resolveStableNodePath", () => {
-  it("resolves Homebrew Cellar path to stable symlink", async () => {
+  it("resolves Homebrew Cellar path to opt symlink", async () => {
+    mockNodePathPresent("/opt/homebrew/opt/node/bin/node");
+
+    const result = await resolveStableNodePath("/opt/homebrew/Cellar/node/25.7.0/bin/node");
+    expect(result).toBe("/opt/homebrew/opt/node/bin/node");
+  });
+
+  it("falls back to bin symlink for default node formula", async () => {
     mockNodePathPresent("/opt/homebrew/bin/node");
 
     const result = await resolveStableNodePath("/opt/homebrew/Cellar/node/25.7.0/bin/node");
     expect(result).toBe("/opt/homebrew/bin/node");
   });
 
-  it("resolves Intel Mac Cellar path to stable symlink", async () => {
-    mockNodePathPresent("/usr/local/bin/node");
+  it("resolves Intel Mac Cellar path to opt symlink", async () => {
+    mockNodePathPresent("/usr/local/opt/node/bin/node");
 
     const result = await resolveStableNodePath("/usr/local/Cellar/node/25.7.0/bin/node");
-    expect(result).toBe("/usr/local/bin/node");
+    expect(result).toBe("/usr/local/opt/node/bin/node");
   });
 
-  it("returns original path when symlink does not exist", async () => {
+  it("resolves versioned node@22 formula to opt symlink", async () => {
+    mockNodePathPresent("/opt/homebrew/opt/node@22/bin/node");
+
+    const result = await resolveStableNodePath("/opt/homebrew/Cellar/node@22/22.12.0/bin/node");
+    expect(result).toBe("/opt/homebrew/opt/node@22/bin/node");
+  });
+
+  it("returns original path when no stable symlink exists", async () => {
     fsMocks.access.mockRejectedValue(new Error("missing"));
 
     const cellarPath = "/opt/homebrew/Cellar/node/25.7.0/bin/node";
@@ -181,7 +195,7 @@ describe("resolveStableNodePath", () => {
 describe("resolvePreferredNodePath — Homebrew Cellar", () => {
   it("resolves Cellar execPath to stable Homebrew symlink", async () => {
     const cellarNode = "/opt/homebrew/Cellar/node/25.7.0/bin/node";
-    const stableNode = "/opt/homebrew/bin/node";
+    const stableNode = "/opt/homebrew/opt/node/bin/node";
     mockNodePathPresent(stableNode);
 
     const execFile = vi.fn().mockResolvedValue({ stdout: "25.7.0\n", stderr: "" });

src/daemon/runtime-paths.ts

@@ -156,21 +156,39 @@ export function renderSystemNodeWarning(
 /**
  * Homebrew Cellar paths (e.g. /opt/homebrew/Cellar/node/25.7.0/bin/node)
  * break when Homebrew upgrades Node and removes the old version directory.
- * Resolve these to the stable Homebrew symlink path (/opt/homebrew/bin/node)
- * which Homebrew updates automatically during upgrades.
+ * Resolve these to a stable Homebrew-managed path that survives upgrades:
+ *   - Default formula "node":  <prefix>/opt/node/bin/node  or  <prefix>/bin/node
+ *   - Versioned formula "node@22":  <prefix>/opt/node@22/bin/node  (keg-only)
  */
 export async function resolveStableNodePath(nodePath: string): Promise<string> {
-  const cellarMatch = nodePath.match(/^(.+?)\/Cellar\/[^/]+\/[^/]+\/bin\/node$/);
+  const cellarMatch = nodePath.match(/^(.+?)\/Cellar\/([^/]+)\/[^/]+\/bin\/node$/);
   if (!cellarMatch) {
     return nodePath;
   }
-  const stablePath = `${cellarMatch[1]}/bin/node`;
+  const prefix = cellarMatch[1]; // e.g. /opt/homebrew
+  const formula = cellarMatch[2]; // e.g. "node" or "node@22"
+
+  // Try the Homebrew opt symlink first — works for both default and versioned formulas.
+  const optPath = `${prefix}/opt/${formula}/bin/node`;
   try {
-    await fs.access(stablePath);
-    return stablePath;
+    await fs.access(optPath);
+    return optPath;
   } catch {
-    return nodePath;
+    // fall through
   }
+
+  // For the default "node" formula, also try the direct bin symlink.
+  if (formula === "node") {
+    const binPath = `${prefix}/bin/node`;
+    try {
+      await fs.access(binPath);
+      return binPath;
+    } catch {
+      // fall through
+    }
+  }
+
+  return nodePath;
 }
 
 export async function resolvePreferredNodePath(params: {