chore: initialize repository baseline

Import the existing Electron + React + TypeScript app as the version-control
baseline before the scanner rework (C# input/capture sidecar, resolution-anchored
layout profiles, OCR preprocessing, eval harness, rescan-merge, GOOD interop).

Housekeeping in this commit:
- Remove orphaned temp_inputhelper_block.ts (duplicate of the input-helper script).
- Ignore .claude/scheduled_tasks.lock local session state.
- Add .gitattributes to normalize line endings (LF in repo).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/lib/autoScanLoop.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, it } from "vitest";
+import { detailFingerprint, fingerprintDataUrl, isRepeatedProcessedPageFingerprint, screenFingerprint } from "./autoScanLoop";
+
+describe("autoScanLoop fingerprints", () => {
+  it("distinguishes captures that share the same prefix but differ later", () => {
+    const sharedPrefix = "data:image/png;base64," + "A".repeat(180);
+    const left = sharedPrefix + "LEFT-" + "B".repeat(600);
+    const right = sharedPrefix + "RIGHT-" + "C".repeat(600);
+
+    expect(fingerprintDataUrl(left)).not.toBe(fingerprintDataUrl(right));
+  });
+
+  it("stays stable for the same capture string", () => {
+    const dataUrl = "data:image/png;base64," + "Q".repeat(2048);
+    expect(fingerprintDataUrl(dataUrl)).toBe(fingerprintDataUrl(dataUrl));
+  });
+
+  it("uses the detail preview for detail-change verification instead of the full frame", () => {
+    const captureA = {
+      detailDataUrl: "data:image/png;base64," + "DETAIL-A".repeat(64),
+      dataUrl: "data:image/png;base64," + "FULL-A".repeat(256),
+    } as const;
+    const captureB = {
+      detailDataUrl: captureA.detailDataUrl,
+      dataUrl: "data:image/png;base64," + "FULL-B".repeat(256),
+    } as const;
+
+    expect(detailFingerprint(captureA as never)).toBe(detailFingerprint(captureB as never));
+  });
+
+  it("uses the inventory preview for scroll verification when available", () => {
+    const captureA = {
+      inventoryDataUrl: "data:image/png;base64," + "GRID-A".repeat(64),
+      dataUrl: "data:image/png;base64," + "FRAME-A".repeat(256),
+    } as const;
+    const captureB = {
+      inventoryDataUrl: "data:image/png;base64," + "GRID-B".repeat(64),
+      dataUrl: captureA.dataUrl,
+    } as const;
+
+    expect(screenFingerprint(captureA as never)).not.toBe(screenFingerprint(captureB as never));
+  });
+
+  it("treats repeated page fingerprints as a loop only after page one", () => {
+    const seen = new Set(["abc"]);
+    expect(isRepeatedProcessedPageFingerprint("abc", seen, 1)).toBe(false);
+    expect(isRepeatedProcessedPageFingerprint("abc", seen, 2)).toBe(true);
+    expect(isRepeatedProcessedPageFingerprint("", seen, 3)).toBe(false);
+  });
+});