test: migrate 207 test files to typed fixture registry (phase 5)

Codemod rewrites all five ad-hoc fixture-path styles to import from the
typed registry (tests/fixtures/index.ts):
- join(__dirname, "..", "fixtures", ...) inline patterns (100 files)
- const FIXTURES = join(__dirname, ...) + join(FIXTURES, ...) (92 files)
- process.cwd()-based paths (10 files)
- path.resolve(__dirname, ...) patterns (5 files)

Registry extended with 8 new keys (portraitJpg, portraitHeic,
motorcycle, svgLogo, barcodeAvif, qrAvif, crossFormatChat,
multipageTiff) and directory accessors (fixtureDir, fixtureRoot).

Dynamic directory scanners (format-matrix-generated,
format-matrix-multimodal, hostile-inputs) preserved via fixtureDir
imports. No fixtures swapped, bytes identical.

Parity gate: dropped 0, net-new 388.

tests/integration/text-overlay.test.ts

@@ -5,14 +5,12 @@
  * and shadow options.
  */
 
-import { readFileSync } from "node:fs";
-import { join } from "node:path";
 import sharp from "sharp";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { fixtures, readFixture } from "../fixtures/index.js";
 import { buildTestApp, createMultipartPayload, loginAsAdmin, type TestApp } from "./test-server.js";
 
-const FIXTURES = join(__dirname, "..", "fixtures");
-const PNG = readFileSync(join(FIXTURES, "test-200x150.png"));
+const PNG = readFixture(fixtures.image.base.png200);
 
 let testApp: TestApp;
 let app: TestApp["app"];
@@ -218,7 +216,7 @@ describe("text-overlay", () => {
   // ── Branch coverage: lines 40-41 (metadata fallback for width/height) ──
 
   it("handles tiny 1x1 image input", async () => {
-    const TINY = readFileSync(join(FIXTURES, "test-1x1.png"));
+    const TINY = readFixture(fixtures.image.edge.px1);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "tiny.png", contentType: "image/png", content: TINY },
       { name: "settings", content: JSON.stringify({ text: "Tiny", position: "center" }) },
@@ -239,7 +237,7 @@ describe("text-overlay", () => {
   // ── HEIC input handling ───────────────────────────────────────────
 
   it("handles HEIC input", { timeout: 120_000 }, async () => {
-    const HEIC = readFileSync(join(FIXTURES, "test-200x150.heic"));
+    const HEIC = readFixture(fixtures.image.base.heic200);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "photo.heic", contentType: "image/heic", content: HEIC },
       { name: "settings", content: JSON.stringify({ text: "HEIC overlay" }) },
@@ -310,7 +308,7 @@ describe("text-overlay", () => {
   // ── JPEG format preserves correctly ───────────────────────────────
 
   it("preserves JPEG format", async () => {
-    const JPG = readFileSync(join(FIXTURES, "test-100x100.jpg"));
+    const JPG = readFixture(fixtures.image.base.jpg100);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "test.jpg", contentType: "image/jpeg", content: JPG },
       { name: "settings", content: JSON.stringify({ text: "JPEG" }) },
@@ -337,7 +335,7 @@ describe("text-overlay", () => {
   // ── Large file (stress test) ──────────────────────────────────────
 
   it("handles stress-large.jpg", async () => {
-    const LARGE = readFileSync(join(FIXTURES, "content", "stress-large.jpg"));
+    const LARGE = readFixture(fixtures.image.stressLarge);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "large.jpg", contentType: "image/jpeg", content: LARGE },
       { name: "settings", content: JSON.stringify({ text: "Stress test", fontSize: 100 }) },
@@ -398,7 +396,7 @@ describe("text-overlay", () => {
   // ── WebP input ───────────────────────────────────────────────────
 
   it("processes WebP input", async () => {
-    const WEBP = readFileSync(join(FIXTURES, "test-50x50.webp"));
+    const WEBP = readFixture(fixtures.image.base.webp50);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "test.webp", contentType: "image/webp", content: WEBP },
       { name: "settings", content: JSON.stringify({ text: "WebP overlay" }) },
@@ -536,7 +534,7 @@ describe("text-overlay", () => {
     "handles HEIF input (motorcycle.heif)",
     { timeout: 120_000 },
     async () => {
-      const HEIF = readFileSync(join(FIXTURES, "content", "motorcycle.heif"));
+      const HEIF = readFixture(fixtures.image.motorcycle);
       const { body, contentType } = createMultipartPayload([
         { name: "file", filename: "photo.heif", contentType: "image/heif", content: HEIF },
         { name: "settings", content: JSON.stringify({ text: "HEIF overlay" }) },
@@ -559,7 +557,7 @@ describe("text-overlay", () => {
   // ── Animated GIF input ──────────────────────────────────────────
 
   it("handles animated GIF input", async () => {
-    const GIF = readFileSync(join(FIXTURES, "animated.gif"));
+    const GIF = readFixture(fixtures.image.animated.gif);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "anim.gif", contentType: "image/gif", content: GIF },
       { name: "settings", content: JSON.stringify({ text: "GIF overlay" }) },
@@ -580,7 +578,7 @@ describe("text-overlay", () => {
   // ── SVG input ───────────────────────────────────────────────────
 
   it("handles SVG input", async () => {
-    const SVG = readFileSync(join(FIXTURES, "test-100x100.svg"));
+    const SVG = readFixture(fixtures.image.base.svg100);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "icon.svg", contentType: "image/svg+xml", content: SVG },
       { name: "settings", content: JSON.stringify({ text: "SVG overlay" }) },
@@ -651,7 +649,7 @@ describe("text-overlay", () => {
   // ── TIFF input format ───────────────────────────────────────────
 
   it("processes TIFF input format", async () => {
-    const TIFF = readFileSync(join(FIXTURES, "formats", "sample.tiff"));
+    const TIFF = readFixture(fixtures.image.formats("tiff"));
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "test.tiff", contentType: "image/tiff", content: TIFF },
       { name: "settings", content: JSON.stringify({ text: "TIFF overlay" }) },
@@ -847,7 +845,7 @@ describe("text-overlay", () => {
   // ── TIFF input with all options ─────────────────────────────────
 
   it("processes TIFF input with background box and shadow at top position", async () => {
-    const TIFF = readFileSync(join(FIXTURES, "formats", "sample.tiff"));
+    const TIFF = readFixture(fixtures.image.formats("tiff"));
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "test.tiff", contentType: "image/tiff", content: TIFF },
       {
@@ -879,7 +877,7 @@ describe("text-overlay", () => {
   // ── Stress large file with background box ───────────────────────
 
   it("handles stress-large.jpg with background box at bottom", async () => {
-    const LARGE = readFileSync(join(FIXTURES, "content", "stress-large.jpg"));
+    const LARGE = readFixture(fixtures.image.stressLarge);
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "large.jpg", contentType: "image/jpeg", content: LARGE },
       {
@@ -909,7 +907,7 @@ describe("text-overlay", () => {
   // ── AVIF input format ──────────────────────────────────────────
 
   it("processes AVIF input", async () => {
-    const AVIF = readFileSync(join(FIXTURES, "formats", "sample.avif"));
+    const AVIF = readFixture(fixtures.image.formats("avif"));
     const { body, contentType } = createMultipartPayload([
       { name: "file", filename: "test.avif", contentType: "image/avif", content: AVIF },
       { name: "settings", content: JSON.stringify({ text: "AVIF overlay" }) },