Improve agent autonomy and diff view readability

Agent behavior improvements:
  - Add project context detection (tsconfig.json, pom.xml, etc.)
  - Enforce validation after changes (tsc --noEmit, mvn compile, etc.)
  - Run tests automatically - never ask "do you want me to run tests"
  - Complete full loop: create → type-check → test → confirm
  - Add command detection for direct execution (run tree, run ls)

  Diff view improvements:
  - Use darker backgrounds for added/removed lines
  - Add diffLineBgAdded, diffLineBgRemoved, diffLineText theme colors
  - Improve text visibility with white text on dark backgrounds
  - Update both React/Ink and SolidJS diff components

  Streaming fixes:
  - Fix tool call argument accumulation using OpenAI index field
  - Fix streaming content display after tool calls
  - Add consecutive error tracking to prevent token waste

  Other changes:
  - ESC to abort operations, Ctrl+C to exit
  - Fix model selection when provider changes in cascade mode
  - Add debug logging for troubleshooting
  - Move tests to root tests/ folder
  - Fix banner test GRADIENT_COLORS reference

test/auto-scroll-constants.test.ts

@@ -0,0 +1,47 @@
+/**
+ * Auto-Scroll Constants Tests
+ *
+ * Tests for auto-scroll constants
+ */
+
+import { describe, it, expect } from "bun:test";
+import {
+  BOTTOM_THRESHOLD,
+  SETTLE_TIMEOUT_MS,
+  AUTO_SCROLL_MARK_TIMEOUT_MS,
+  KEYBOARD_SCROLL_LINES,
+  PAGE_SCROLL_LINES,
+  MOUSE_SCROLL_LINES,
+} from "../src/constants/auto-scroll";
+
+describe("Auto-Scroll Constants", () => {
+  it("should have reasonable bottom threshold", () => {
+    expect(BOTTOM_THRESHOLD).toBeGreaterThan(0);
+    expect(BOTTOM_THRESHOLD).toBeLessThan(20);
+  });
+
+  it("should have reasonable settle timeout", () => {
+    expect(SETTLE_TIMEOUT_MS).toBeGreaterThan(100);
+    expect(SETTLE_TIMEOUT_MS).toBeLessThan(1000);
+  });
+
+  it("should have reasonable auto-scroll mark timeout", () => {
+    expect(AUTO_SCROLL_MARK_TIMEOUT_MS).toBeGreaterThan(100);
+    expect(AUTO_SCROLL_MARK_TIMEOUT_MS).toBeLessThan(500);
+  });
+
+  it("should have reasonable keyboard scroll lines", () => {
+    expect(KEYBOARD_SCROLL_LINES).toBeGreaterThan(0);
+    expect(KEYBOARD_SCROLL_LINES).toBeLessThan(20);
+  });
+
+  it("should have reasonable page scroll lines", () => {
+    expect(PAGE_SCROLL_LINES).toBeGreaterThan(KEYBOARD_SCROLL_LINES);
+    expect(PAGE_SCROLL_LINES).toBeLessThan(50);
+  });
+
+  it("should have reasonable mouse scroll lines", () => {
+    expect(MOUSE_SCROLL_LINES).toBeGreaterThan(0);
+    expect(MOUSE_SCROLL_LINES).toBeLessThan(10);
+  });
+});