feat(keyboard): add clipboard voice command mode

Long-press mic runs ASR as an instruction over eligible clipboard text,
with host-confirm recording UI, min-record gate, and light ASR prewarm.
Bump CURRENT_PROJECT_VERSION to 53.

OSGKeyboardTests/ClipboardCommandPromptComposerTests.swift

@@ -0,0 +1,58 @@
+// ClipboardCommandPromptComposerTests.swift
+// OSGKeyboardTests
+
+import XCTest
+@testable import OSGKeyboardShared
+
+final class ClipboardCommandPromptComposerTests: XCTestCase {
+
+    func testUserMessageIncludesMaterialInstructionAndPrevious() {
+        let input = ClipboardCommandPromptComposer.Input(
+            snapshot: "对方说周末见面",
+            instruction: "委婉拒绝",
+            previousOutput: "这周不太方便"
+        )
+        let user = ClipboardCommandPromptComposer.userMessage(input, language: .chinese)
+        XCTAssertTrue(user.contains("【材料】"))
+        XCTAssertTrue(user.contains("对方说周末见面"))
+        XCTAssertTrue(user.contains("【指令】"))
+        XCTAssertTrue(user.contains("委婉拒绝"))
+        XCTAssertTrue(user.contains("【上一版结果】"))
+        XCTAssertTrue(user.contains("这周不太方便"))
+    }
+
+    func testSystemPromptDoesNotEmbedR6DictationBan() {
+        let system = ClipboardCommandPromptComposer.compose(
+            .init(snapshot: "材料", instruction: "总结"),
+            language: .chinese
+        )
+        XCTAssertTrue(system.contains("剪贴板写作助手"))
+        XCTAssertFalse(system.contains("不是向你提出的问题或命令"))
+    }
+
+    func testEligibilityTrackerKeepsSameChangeCountWindow() {
+        let first = ClipboardCommandEligibilityTracker.refresh(
+            changeCount: 3,
+            rawText: "周末有空一起吃个饭吗？我想聊下项目进度。",
+            previous: nil,
+            now: 1_000
+        )
+        XCTAssertNotNil(first)
+
+        let same = ClipboardCommandEligibilityTracker.refresh(
+            changeCount: 3,
+            rawText: "周末有空一起吃个饭吗？我想聊下项目进度。",
+            previous: first,
+            now: 1_010
+        )
+        XCTAssertEqual(same?.startedAt, first?.startedAt)
+
+        let expired = ClipboardCommandEligibilityTracker.refresh(
+            changeCount: 3,
+            rawText: "周末有空一起吃个饭吗？我想聊下项目进度。",
+            previous: first,
+            now: 1_040
+        )
+        XCTAssertNil(expired)
+    }
+}

OSGKeyboardTests/ClipboardMaterialFilterTests.swift

@@ -0,0 +1,75 @@
+// ClipboardMaterialFilterTests.swift
+// OSGKeyboardTests
+
+import XCTest
+@testable import OSGKeyboardShared
+
+final class ClipboardMaterialFilterTests: XCTestCase {
+
+    func testRejectsEmpty() {
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("   "), .rejected(.empty))
+    }
+
+    func testRejectsPhoneAndNumeric() {
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("13812345678"), .rejected(.phoneOrNumeric))
+        XCTAssertEqual(
+            ClipboardMaterialFilter.evaluate("+86 138-1234-5678"),
+            .rejected(.phoneOrNumeric)
+        )
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("123-456"), .rejected(.phoneOrNumeric))
+    }
+
+    func testRejectsEmojiOrSymbolOnly() {
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("😀😀😀"), .rejected(.emojiOrSymbolOnly))
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("！！！"), .rejected(.emojiOrSymbolOnly))
+    }
+
+    func testRejectsVerificationCode() {
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("A8f2K1"), .rejected(.verificationCode))
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("x9Y2"), .rejected(.verificationCode))
+    }
+
+    func testRejectsTooShort() {
+        // 周末吃饭吗 = 5 graphemes
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate("周末吃饭吗"), .rejected(.tooShort))
+        let fourteen = String(repeating: "啊", count: 14)
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate(fourteen), .rejected(.tooShort))
+    }
+
+    func testRejectsRepetitiveSpam() {
+        let spam = String(repeating: "啊", count: 15)
+        XCTAssertEqual(ClipboardMaterialFilter.evaluate(spam), .rejected(.repetitiveSpam))
+    }
+
+    func testAcceptsNaturalLanguage() {
+        let text = "周末有空一起吃个饭吗？我想聊下项目进度。"
+        switch ClipboardMaterialFilter.evaluate(text) {
+        case .eligible(let snapshot):
+            XCTAssertEqual(snapshot, text)
+        case .rejected(let reason):
+            XCTFail("expected eligible, got \(reason)")
+        }
+    }
+
+    func testAllowsDigitsInsideNaturalSentence() {
+        let text = "明天 3 点见，我们在咖啡厅门口碰头再走。"
+        if case .rejected = ClipboardMaterialFilter.evaluate(text) {
+            XCTFail("sentence with digits should remain eligible")
+        }
+    }
+
+    func testTruncateSnapshot() {
+        let long = String(repeating: "汉", count: 3_050)
+        let truncated = ClipboardMaterialFilter.truncateSnapshot(long)
+        XCTAssertEqual(truncated.count, ClipboardMaterialFilter.maxSnapshotLength)
+    }
+
+    func testConstantsMatchPlan() {
+        XCTAssertEqual(ClipboardMaterialFilter.minimumLength, 15)
+        XCTAssertEqual(ClipboardMaterialFilter.maxSnapshotLength, 3_000)
+        XCTAssertEqual(ClipboardMaterialFilter.longPressDuration, 0.45, accuracy: 0.001)
+        XCTAssertEqual(ClipboardMaterialFilter.minimumRecordingAfterHostConfirm, 0.70, accuracy: 0.001)
+        XCTAssertEqual(ClipboardMaterialFilter.eligibilityDuration, 30, accuracy: 0.001)
+        XCTAssertEqual(ClipboardMaterialFilter.sessionDuration, 30, accuracy: 0.001)
+    }
+}