fix: release QA hardening across processing, media, security, and CI gates (#649)

A release-readiness QA pass over the whole product. The commits split into
defects a user would hit and gates that were reporting green while measuring
nothing.

## Fixes that change behaviour

Rate limiting was bypassable on every install: TRUST_PROXY defaulted to true, so
request.ip came from a client-set header and a forged X-Forwarded-For got past
the login limiter. The default is now a private-network trust list.

A transient Postgres outage stranded in-flight jobs, leaving finished output on
disk with no row pointing at it. A reconciler now resolves those rows and adopts
the bytes rather than dropping the work.

A Redis connection that moved to a new address wedged every read-blocked
consumer, so completions stopped signalling while health still answered 200.
Socket timeouts plus subscriber pings recover it.

Installing more than one AI bundle left the shared venv multi-versioned and
silently broke three tools. The installer now reconciles distributions to one
version each.

Converting an image to JXL at quality 1 through 4 returned a 500, because
libjxl 0.7 rejects the distance those values compute. The quality is floored at
what the encoder honours. A missing ffmpeg was also reported to the user as a
corrupt upload; it now says the engine is unavailable.

RAW uploads reached an unpatched LibRaw on arm64, so it is built from source at
0.22.2, and the release scan was split so it can fail on an unfixed critical
instead of hiding it behind ignore-unfixed.

## Gates that could not fail

Two mutation lanes ran zero mutants because Stryker crawled the gitignored docs
build; coverage discarded its whole report on any failing test; the lint gate
skipped root tests, scripts, and two workspaces; and several generated matrices
counted a host missing ffmpeg as a passing tool. Each now measures what it
claims.

Full evidence and the outstanding release items are tracked locally and are not
part of this branch.

packages/image-engine/tests/edit-strip-metadata.test.ts

@@ -1,6 +1,6 @@
 import exifReader from "exif-reader";
 import sharp from "sharp";
-import { beforeAll, describe, expect, it } from "vitest";
+import { beforeAll, describe, expect, it, vi } from "vitest";
 import { editMetadata } from "../src/operations/edit-metadata.js";
 import { stripMetadata } from "../src/operations/strip-metadata.js";
 import type { Sharp } from "../src/types.js";
@@ -14,8 +14,10 @@ const richImage = (): Sharp => sharp(richBuffer);
 interface ExifSections {
   hasExif: boolean;
   hasIcc: boolean;
+  hasXmp: boolean;
   image: NonNullable<ReturnType<typeof exifReader>["Image"]>;
   photo: NonNullable<ReturnType<typeof exifReader>["Photo"]>;
+  gps: NonNullable<ReturnType<typeof exifReader>["GPSInfo"]>;
 }
 
 // Encode the pipeline to a JPEG buffer and decode its EXIF/ICC so we can assert
@@ -23,12 +25,14 @@ interface ExifSections {
 async function readBack(image: Sharp): Promise<ExifSections> {
   const buf = await image.jpeg().toBuffer();
   const meta = await sharp(buf).metadata();
-  const parsed = meta.exif ? exifReader(meta.exif) : { Image: {}, Photo: {} };
+  const parsed = meta.exif ? exifReader(meta.exif) : {};
   return {
     hasExif: !!meta.exif,
     hasIcc: !!meta.icc,
+    hasXmp: !!meta.xmp,
     image: parsed.Image ?? {},
     photo: parsed.Photo ?? {},
+    gps: parsed.GPSInfo ?? {},
   };
 }
 
@@ -51,8 +55,17 @@ beforeAll(async () => {
       IFD2: {
         DateTimeOriginal: "2001:01:01 01:01:01",
       },
+      IFD3: {
+        GPSLatitudeRef: "N",
+        GPSLatitude: "40 30 0",
+        GPSLongitudeRef: "W",
+        GPSLongitude: "74 0 0",
+      },
     })
     .withIccProfile("srgb")
+    .withXmp(
+      '<?xpacket begin=""?><x:xmpmeta xmlns:x="adobe:ns:meta/"><rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Description xmlns:dc="http://purl.org/dc/elements/1.1/" dc:title="SnapOtter XMP"/></rdf:RDF></x:xmpmeta><?xpacket end="w"?>',
+    )
     .jpeg()
     .toBuffer();
 });
@@ -143,7 +156,7 @@ describe("editMetadata", () => {
   });
 
   it("removes a requested field via fieldsToRemove while keeping the rest", async () => {
-    const { image } = await readBack(
+    const { gps, hasIcc, hasXmp, image } = await readBack(
       await editMetadata(richImage(), { fieldsToRemove: ["Software"] }),
     );
     // Removed field is gone...
@@ -152,6 +165,12 @@ describe("editMetadata", () => {
     expect(image.Artist).toBe("OrigArtist");
     expect(image.Copyright).toBe("OrigCopyright");
     expect(image.ImageDescription).toBe("OrigDesc");
+    expect(gps.GPSLatitudeRef).toBe("N");
+    expect(gps.GPSLatitude).toEqual([40, 30, 0]);
+    expect(gps.GPSLongitudeRef).toBe("W");
+    expect(gps.GPSLongitude).toEqual([74, 0, 0]);
+    expect(hasIcc).toBe(true);
+    expect(hasXmp).toBe(true);
   });
 
   it("removes a field AND applies an edit in the same call (withExif rebuild path)", async () => {
@@ -194,11 +213,36 @@ describe("editMetadata", () => {
   it("treats clearGps:true as a removal trigger, rebuilding EXIF while keeping fields", async () => {
     // clearGps flips hasRemovals true even with an empty fieldsToRemove, so the
     // function rebuilds EXIF from the source rather than taking keepMetadata().
-    const { hasExif, image } = await readBack(await editMetadata(richImage(), { clearGps: true }));
+    const { gps, hasExif, image } = await readBack(
+      await editMetadata(richImage(), { clearGps: true }),
+    );
     expect(hasExif).toBe(true);
     // Non-GPS IFD0 fields survive the rebuild verbatim.
     expect(image.Artist).toBe("OrigArtist");
     expect(image.Copyright).toBe("OrigCopyright");
+    expect(gps).toEqual({});
+  });
+
+  it("removes a specifically requested GPS field while preserving sibling GPS fields", async () => {
+    const { gps } = await readBack(
+      await editMetadata(richImage(), { fieldsToRemove: ["GPSLatitude"] }),
+    );
+    expect(gps.GPSLatitude).toBeUndefined();
+    expect(gps.GPSLongitudeRef).toBe("W");
+    expect(gps.GPSLongitude).toEqual([74, 0, 0]);
+  });
+
+  it("fails safely when existing EXIF cannot be parsed during a removal", async () => {
+    const withExif = vi.fn();
+    const fake = {
+      metadata: vi.fn().mockResolvedValue({ exif: Buffer.from("not-valid-exif") }),
+      withExif,
+    } as unknown as Sharp;
+
+    await expect(editMetadata(fake, { fieldsToRemove: ["Software"] })).rejects.toThrow(
+      "Cannot safely edit metadata because existing EXIF data is invalid",
+    );
+    expect(withExif).not.toHaveBeenCalled();
   });
 
   it("does not change image dimensions or format", async () => {
@@ -211,10 +255,11 @@ describe("editMetadata", () => {
 });
 
 describe("stripMetadata", () => {
-  it("sanity check: the rich fixture carries both EXIF and ICC", async () => {
+  it("sanity check: the rich fixture carries EXIF, ICC, and XMP", async () => {
     const meta = await sharp(richBuffer).metadata();
     expect(meta.exif).toBeTruthy();
     expect(meta.icc).toBeTruthy();
+    expect(meta.xmp?.toString()).toContain("SnapOtter XMP");
   });
 
   it("strips both EXIF and ICC when stripAll is true", async () => {
@@ -270,25 +315,34 @@ describe("stripMetadata", () => {
     expect(hasIcc).toBe(true);
   });
 
-  it("keeps EXIF but strips ICC when only stripIcc is true", async () => {
-    const { hasExif, hasIcc } = await readBack(
+  it("keeps EXIF and XMP but strips ICC when only stripIcc is true", async () => {
+    const { hasExif, hasIcc, hasXmp } = await readBack(
       await stripMetadata(richImage(), { stripIcc: true }),
     );
     expect(hasExif).toBe(true);
     expect(hasIcc).toBe(false);
+    expect(hasXmp).toBe(true);
   });
 
   it("keeps both EXIF and ICC when only stripXmp is true (selective mode)", async () => {
-    // XMP has no keepXmp(); it is always stripped in selective mode. EXIF and ICC
-    // are both preserved because neither of their guards trips.
-    const { hasExif, hasIcc, image } = await readBack(
+    const { hasExif, hasIcc, hasXmp, image } = await readBack(
       await stripMetadata(richImage(), { stripXmp: true }),
     );
     expect(hasExif).toBe(true);
     expect(hasIcc).toBe(true);
+    expect(hasXmp).toBe(false);
     expect(image.Artist).toBe("OrigArtist");
   });
 
+  it("preserves XMP when selectively stripping EXIF", async () => {
+    const { hasExif, hasIcc, hasXmp } = await readBack(
+      await stripMetadata(richImage(), { stripExif: true, stripXmp: false }),
+    );
+    expect(hasExif).toBe(false);
+    expect(hasIcc).toBe(true);
+    expect(hasXmp).toBe(true);
+  });
+
   it("strips both EXIF and ICC when stripExif and stripIcc are both true", async () => {
     const { hasExif, hasIcc } = await readBack(
       await stripMetadata(richImage(), { stripExif: true, stripIcc: true }),