docs: complete housekeeping migration matrix

src/features/housekeeping/migration/matrix.test.ts

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+import { describe, expect, it } from "vitest";
+import { discoverLegacyPages } from "./discover-legacy-pages";
+import { HOUSEKEEPING_MIGRATION_MATRIX } from "./matrix";
+import { validateMigrationEntries } from "./validate-matrix";
+
+describe("HOUSEKEEPING_MIGRATION_MATRIX", () => {
+	it("covers all 137 legacy pages exactly once", () => {
+		const discovered = discoverLegacyPages();
+
+		expect(HOUSEKEEPING_MIGRATION_MATRIX).toHaveLength(137);
+		expect(
+			validateMigrationEntries(discovered, HOUSEKEEPING_MIGRATION_MATRIX),
+		).toEqual([]);
+	});
+
+	it("contains no undecided evidence markers", () => {
+		expect(JSON.stringify(HOUSEKEEPING_MIGRATION_MATRIX)).not.toMatch(
+			/TBD|TODO|FIXME|UNCLASSIFIED/,
+		);
+	});
+
+	it("is sorted by legacy path", () => {
+		expect(HOUSEKEEPING_MIGRATION_MATRIX.map((row) => row.legacyPath)).toEqual(
+			[...HOUSEKEEPING_MIGRATION_MATRIX.map((row) => row.legacyPath)].sort(
+				(a, b) => a.localeCompare(b),
+			),
+		);
+	});
+});