fix: make apply-patch default to v2

scripts/src/apply-patch-v2.ts

@@ -75,18 +75,18 @@ export function isApplyPatchV2HelpArgs(args: string[] = []): boolean {
 export function applyPatchV2HelpPayload() {
   return {
     ok: true,
-    command: "ssh <route> v2 < patch.diff",
+    command: "ssh <route> apply-patch < patch.diff",
     summary: "Apply a standard apply_patch patch to a remote route with the local v2 line-based engine.",
     usage: [
-      "tran G14:/root/hwlab/.worktree/task v2 < patch.diff",
-      "bun scripts/cli.ts ssh D601:/tmp v2 < patch.diff"
+      "tran G14:/root/hwlab/.worktree/task apply-patch < patch.diff",
+      "bun scripts/cli.ts ssh D601:/tmp apply-patch < patch.diff"
     ],
     input: {
       required: true,
       firstLine: beginMarker,
       lastLine: endMarker
     },
-    note: "v2 reads patch text from stdin. Use `script -- ...` for ordinary remote shell commands."
+    note: "apply-patch reads patch text from stdin and uses the v2 engine by default. Use `apply-patch-v1` only for the legacy helper."
   };
 }
 
@@ -167,13 +167,25 @@ export async function runApplyPatchV2(options: ApplyPatchV2Options): Promise<num
     options.stdout.write(`${JSON.stringify(applyPatchV2HelpPayload(), null, 2)}\n`);
     return 0;
   }
+  if ((options.argv?.length ?? 0) > 0) {
+    options.stdout.write(`${JSON.stringify({
+      ok: false,
+      error: {
+        code: "apply_patch_unsupported_args",
+        message: "ssh apply-patch uses the v2 engine and accepts no helper flags. Use apply-patch-v1 for legacy helper options."
+      },
+      unsupportedArgs: options.argv,
+      help: applyPatchV2HelpPayload()
+    }, null, 2)}\n`);
+    return 2;
+  }
   const patchText = await readStreamText(options.stdin);
   if (!patchText.trim()) {
     options.stdout.write(`${JSON.stringify({
       ok: false,
       error: {
-        code: "v2_patch_stdin_required",
-        message: "ssh v2 requires patch text on stdin."
+        code: "apply_patch_stdin_required",
+        message: "ssh apply-patch requires patch text on stdin."
       },
       help: applyPatchV2HelpPayload()
     }, null, 2)}\n`);