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>

electron/repositories/reviewSamplesRepository.ts

@@ -0,0 +1,39 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import type { ReviewSampleListResult, ReviewSamplesRepositoryPort, ReviewSamplePayload } from "./contracts.js";
+import type { ReviewSampleRecord, SaveResultWithPath } from "../../src/types/global.js";
+
+export class ReviewSamplesRepository implements ReviewSamplesRepositoryPort {
+  private readonly filePath: string;
+
+  constructor(userDataPath: string, fileName = "review-samples.jsonl") {
+    this.filePath = path.join(userDataPath, fileName);
+  }
+
+  async list(limit = 50): Promise<ReviewSampleListResult> {
+    try {
+      const raw = await fs.readFile(this.filePath, "utf8");
+      const lines = raw.split(/\r?\n/).filter(Boolean);
+      const safeLimit = Math.max(1, Math.min(200, Number(limit) || 50));
+      const samples = lines
+        .slice(-safeLimit)
+        .map((line) => {
+          try {
+            return JSON.parse(line) as ReviewSampleRecord;
+          } catch {
+            return null;
+          }
+        })
+        .filter(Boolean) as ReviewSampleRecord[];
+      return { ok: true, samples: samples.reverse(), total: lines.length, path: this.filePath };
+    } catch {
+      return { ok: true, samples: [], total: 0, path: this.filePath };
+    }
+  }
+
+  async append(sample: ReviewSamplePayload): Promise<SaveResultWithPath> {
+    await fs.mkdir(path.dirname(this.filePath), { recursive: true });
+    await fs.appendFile(this.filePath, `${JSON.stringify({ savedAt: new Date().toISOString(), sample })}\n`, "utf8");
+    return { ok: true, path: this.filePath };
+  }
+}