fix: resume selection under-reports task totals with multiple loops

The resume prompt counted total/completed from progress.tasks, which only
records TOUCHED tasks (started/completed/failed) — never-started tasks were
silently missing, and file-checkbox completions weren't counted unless
markCompleted had run. With e.g. 10 tasks where 3 completed and 5 untouched,
it showed 3/5 done instead of 3/10 done.

- add countPRDResumeStats (src/utils.ts): total from parseTaskFile of the
  PRD source; completed = progress completions ∪ PRD checkbox completions,
  deduped by task id; failed from progress. Falls back to touched-task
  counts when the source file is missing/unparseable.
- selectPRDToResume (index.ts) uses the helper instead of Object.keys().
- tests/resume-stats.test.ts: 4 regression tests.

Includes pre-existing uncommitted changes: index.ts tab-reformat (matches
src/ style) and package.json version bump 0.4.2 -> 0.4.3.

tests/resume-stats.test.ts

@@ -0,0 +1,87 @@
+/// <reference types="bun-types" />
+import { describe, it, expect, beforeEach } from "bun:test";
+import * as fs from "node:fs";
+import * as os from "node:os";
+import * as path from "node:path";
+import { ProgressTracker } from "../src/progress";
+import { countPRDResumeStats } from "../src/utils";
+
+/**
+ * Regression test: the resume-selection prompt under-reported task totals
+ * when multiple loop histories existed. The progress tracker only records
+ * TOUCHED tasks (started/completed/failed) — never-started tasks are absent
+ * from prd.tasks, so a naive Object.keys() count missed them entirely, and
+ * file-checked completions were ignored unless markCompleted had run.
+ * countPRDResumeStats derives the true total from the parsed PRD file and
+ * counts checkbox completions too.
+ */
+let root: string;
+
+beforeEach(() => {
+	root = fs.mkdtempSync(path.join(os.tmpdir(), "ralpi-stats-test-"));
+});
+
+const PRD_CONTENT = `# Test PRD
+
+## Tasks
+- [ ] Task one
+- [x] Task two
+- [ ] Task three
+- [ ] Task four
+`;
+
+function writePRD(rel: string): string {
+	const p = path.join(root, rel);
+	fs.mkdirSync(path.dirname(p), { recursive: true });
+	fs.writeFileSync(p, PRD_CONTENT, "utf-8");
+	return p;
+}
+
+describe("countPRDResumeStats", () => {
+	it("reports the full task total from the PRD file, not just touched tasks", () => {
+		const sourcePath = writePRD("tasks/a/README.md");
+		const progress = new ProgressTracker(root, sourcePath);
+
+		// Simple-checkbox format assigns sequential ids 00-03. Only 00
+		// (completed) and 02 (failed) were touched by the loop; 01 is checked
+		// off in the file; 03 was never started.
+		progress.markCompleted("00", 1000);
+		progress.markFailed("02", "boom");
+
+		const stats = countPRDResumeStats(progress.getState(), sourcePath);
+		expect(stats.total).toBe(4); // old code reported 2
+		expect(stats.completed).toBe(2); // 00 via progress + 01 via checkbox
+		expect(stats.failed).toBe(1);
+	});
+
+	it("does not double-count a task that is both progress-completed and file-checked", () => {
+		const sourcePath = writePRD("tasks/b/README.md");
+		const progress = new ProgressTracker(root, sourcePath);
+
+		progress.markCompleted("01", 500); // 01 already [x] in the file
+
+		const stats = countPRDResumeStats(progress.getState(), sourcePath);
+		expect(stats.completed).toBe(1);
+	});
+
+	it("falls back to touched-task counts when the PRD file is missing", () => {
+		const missing = path.join(root, "tasks/gone/README.md");
+		const progress = new ProgressTracker(root, missing);
+		progress.markCompleted("01", 1000);
+		progress.markFailed("02", "nope");
+
+		const stats = countPRDResumeStats(progress.getState(), missing);
+		expect(stats.total).toBe(2);
+		expect(stats.completed).toBe(1);
+		expect(stats.failed).toBe(1);
+	});
+
+	it("reports zero for a never-touched PRD with no file", () => {
+		const missing = path.join(root, "tasks/none/README.md");
+		const progress = new ProgressTracker(root, missing);
+		const stats = countPRDResumeStats(progress.getState(), missing);
+		expect(stats.total).toBe(0);
+		expect(stats.completed).toBe(0);
+		expect(stats.failed).toBe(0);
+	});
+});