Fix vch land wrong-branch diagnostic

CHANGELOG.md

@@ -8,6 +8,11 @@ The English README is the source of truth; localized READMEs may lag.
 
 ## Unreleased
 
+### Fixed
+- Clarified `vch land` wrong-branch diagnostics so resolved `--into`
+  failures show the target branch and no longer suggest passing
+  `--into` again (#124).
+
 ## 0.9.1 - 2026-05-15
 
 ### Changed

Sources/VibeChardCore/Domain/Errors.swift

@@ -198,7 +198,7 @@ public enum VibeChardError: Error, CustomStringConvertible {
             return "no log file at \(path) — \(hint)"
         case let .landMainNotOnInto(currentBranch, want):
             let cur = currentBranch.map { "'\($0)'" } ?? "(detached HEAD)"
-            return "refusing to land: main worktree is on \(cur), not '\(want)' (use `git switch \(want)` first or pass --into)"
+            return "refusing to land: target branch is '\(want)', but the main worktree is currently on \(cur); run `git switch \(want)` first from the main worktree"
         case let .landMergeOverlap(paths):
             let listing = paths.map { "  \($0)" }.joined(separator: "\n")
             return "refusing to land: \(paths.count) file\(paths.count == 1 ? "" : "s") in main worktree overlap the task branch's diff (stash or commit them, or pass --allow-dirty):\n\(listing)"

Tests/VibeChardCoreTests/Domain/ErrorsTests.swift

@@ -4,6 +4,25 @@ import XCTest
 
 final class ErrorsTests: XCTestCase {
 
+    // MARK: - land diagnostics (#124)
+
+    func testLandMainNotOnIntoMessageNamesTargetAndCurrentBranch() {
+        let err = VibeChardError.landMainNotOnInto(
+            currentBranch: "v3.1.0",
+            want: "main"
+        )
+        let msg = err.description
+
+        XCTAssertTrue(msg.contains("target branch is 'main'"),
+                      "expected target branch in: \(msg)")
+        XCTAssertTrue(msg.contains("main worktree is currently on 'v3.1.0'"),
+                      "expected current branch in: \(msg)")
+        XCTAssertTrue(msg.contains("git switch main"),
+                      "expected direct switch hint in: \(msg)")
+        XCTAssertFalse(msg.contains("pass --into"),
+                       "must not suggest --into after the target has already been resolved; got: \(msg)")
+    }
+
     // MARK: - worktreeBusy (#65)
 
     func testWorktreeBusyMessageRecommendsForceFlag() {