test(m4): retry Start Read until the chartread session is running

testTwoPassAverageFailurePromotesFirstPass died on Gitea run 35443
waiting for btnCalibrate after a single Start click. Handheld in the
same job succeeded: AX reported enabled and synthesized the click, but
SwiftUI startRead() was still a no-op (same class as 35251).

Re-click until btnCancel/Calibrate/Trigger exist — Cancel is in the
tree for the whole session — then wait for Calibrate.

Tests/ICCeryUITests/Milestone2UITests.swift

@@ -36,6 +36,7 @@ final class Milestone2UITests: XCTestCase {
             "ICCERY_UI_TESTING": "1",
             "ICCERY_TEST_ROOT": testRoot.path,
             "ICCERY_ARGYLL_BINARY_DIR": binDir.path,
+            "ICCERY_CUPS_BIN_DIR": binDir.path,
             "ICCERY_TEST_SAVE_TARGET":
                 workDir.appendingPathComponent("mytarget.ti1").path,
             "ICCERY_TEST_WORKDIR": workDir.path,
@@ -218,11 +219,12 @@ final class Milestone2UITests: XCTestCase {
         XCTAssertTrue(FileManager.default.fileExists(
             atPath: workDir.appendingPathComponent("mytarget.ti2").path))
 
-        // Print panel is live from M3; a default printer is selected
+        // Print panel is live from M3. GitHub macos-14 has no system
-        // so both the all-pages and per-page print buttons are enabled.
+        // queues, so mock CUPS (`ICCERY_CUPS_BIN_DIR`) must enumerate
+        // before Print All / per-page enable (run 34867767434).
         XCTAssertTrue(element("rawPrintPanel").exists)
-        XCTAssertTrue(app.buttons["btnPrintAll"].isEnabled)
+        _ = waitUntilEnabled("btnPrintAll", timeout: 15)
-        XCTAssertTrue(app.buttons["btnPrintPage-0"].isEnabled)
+        _ = waitUntilEnabled("btnPrintPage-0", timeout: 15)
         XCTAssertTrue(app.buttons["btnAdvanceToStage3"].isEnabled)
     }
 

Tests/ICCeryUITests/Milestone4UITests.swift

@@ -154,15 +154,34 @@ final class Milestone4UITests: XCTestCase {
 
     /// Runs the mock handheld chartread session to completion
     /// (start → calibrate → strip A → strip B → Done & Save).
+    ///
+    /// `isEnabled` can be true in AX while the SwiftUI action is still
+    /// a no-op (runs 35251, 35443). Re-click until the session is
+    /// actually running (`btnCancel` is shown whenever
+    /// `isChartreadRunning`), then wait for Calibrate.
     private func driveOnePass(startButton: String) {
         let start = app.buttons[startButton]
-        XCTAssertTrue(start.waitForExistence(timeout: 10))
+        XCTAssertTrue(start.waitForExistence(timeout: 10), startButton)
-        let deadline = Date().addingTimeInterval(10)
+        let enabledBy = Date().addingTimeInterval(10)
-        while Date() < deadline, !start.isEnabled {
+        while Date() < enabledBy, !start.isEnabled {
             RunLoop.current.run(until: Date().addingTimeInterval(0.1))
         }
-        XCTAssertTrue(start.isEnabled)
+        XCTAssertTrue(start.isEnabled, "\(startButton) never enabled")
+
+        let sessionBy = Date().addingTimeInterval(25)
+        while Date() < sessionBy, !chartreadSessionRunning {
+            if start.exists, start.isEnabled {
                 start.click()
+            }
+            RunLoop.current.run(until: Date().addingTimeInterval(0.4))
+        }
+        XCTAssertTrue(
+            chartreadSessionRunning,
+            "\(startButton) click never started chartread; "
+                + "notice=\(element("noticeText").value as? String ?? "") "
+                + "start.exists=\(start.exists)"
+        )
+
         _ = waitFor("btnCalibrate", timeout: 25)
         app.buttons["btnCalibrate"].click()
         driveStripsUntilDone()
@@ -170,6 +189,14 @@ final class Milestone4UITests: XCTestCase {
         app.buttons["btnDoneRead"].firstMatch.click()
     }
 
+    /// `btnCancel` is in the tree for the whole chartread session;
+    /// Calibrate/Trigger only appear after the first classified prompt.
+    private var chartreadSessionRunning: Bool {
+        element("btnCancel").exists
+            || element("btnCalibrate").exists
+            || element("btnTrigger").exists
+    }
+
     /// Clicks Trigger for each remaining strip until `btnDoneRead`
     /// appears — the button is re-polled each pass so a click that
     /// races a state transition isn't lost.