fix(native): name the CLI flag that selects another plist

rea inspect-plist takes the target as its positional path and selects a
plist with --relative-path, so "Pass path" pointed CLI callers at the
wrong argument. Name the MCP path input and the CLI flag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/native/NativeMacOSProvider.ts

@@ -820,7 +820,7 @@ const unreadablePlist = (
 ): AnalysisError => {
   const sentence = reason.endsWith(".") ? reason : `${reason}.`;
   // Name the default that is missing and the selection that still works.
-  const missingDefault = `The target has no readable Contents/Info.plist at ${path}: ${sentence} Pass path to inspect another plist.`;
+  const missingDefault = `The target has no readable Contents/Info.plist at ${path}: ${sentence} Select another plist in the target with the path input (CLI: --relative-path).`;
   return requested === undefined
     ? new AnalysisCapabilityUnavailableError(
         IDENTITY.id,

tests/boundary/cli/nativePlistSelectionFailureCli.test.ts

@@ -113,12 +113,10 @@ describe.skipIf(process.platform !== "darwin")(
         expect(result.exitCode).toBe(1);
         expect(result.json).toMatchObject({
           code: "capability_unavailable",
-          message: expect.stringContaining(
-            "Pass path to inspect another plist",
-          ),
+          message: expect.stringContaining("(CLI: --relative-path)"),
           remediation: {
             action: expect.stringContaining(
-              "Pass path to inspect another plist",
+              "Select another plist in the target with the path input (CLI: --relative-path).",
             ),
           },
           details: {