From 9e757c5396f5bd1e4caf4d7ff8505184ba93e4b4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gerg=C5=91=20T=C3=B6rcsv=C3=A1ri?=
 <torcsvari.gergo@gmail.com>
Date: Fri, 28 Aug 2026 13:56:53 +0200
Subject: [PATCH] =?UTF-8?q?findings=20R:=20coverage=20for=20the=20demo-led?=
 =?UTF-8?q?ger=20fixes=20(R-2,=20R-3,=20R-4,=20R-9)=20=E2=80=94=20tests=20?=
 =?UTF-8?q?only?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- R-9: tests/kicad/project-sync.spec.ts gains an effect-asserting test —
  stages a self-contained footprint lib (ecc83 R_Axial as SyncFixture.pretty
  + absolute-uri fp-lib-table via a new stageAndOpen beforeOpen hook), presses
  Update PCB, and asserts the board's footprint references through
  kicadCollabSnapshot/kicadCollabTestItemBlob (R777, then R888 after a
  schematic rewrite + re-sync). Red-first: the dialog report said "Add R777"
  while the board stayed empty when the button click never landed.
- R-2: tests/kicad/via-snapshot-assert.spec.ts — two-via board, exact widths
  + no PCB_VIA::GetWidth wx assert line in the console.
- R-4: tests/web/console-copy.spec.ts — Ctrl/Cmd+C over a console selection
  fires `copy` (guard stops the keydown before wx); canvas pointerdown
  collapses the selection. ControlOrMeta: headless engines use the HOST copy
  accelerator regardless of the device UA.
- R-3: workers/cdn gets a vitest harness (package.json + lockfile) and
  test/index.test.ts with a workerd-like stub bucket (always-defined range):
  plain GET is 200/no Content-Range, Range → 206, HEAD/304/404/405/OPTIONS.
  Mutation-verified (pre-1ea35f7 gating → 2 reds). CI step added after the
  corpus lint; node_modules gitignored.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015j8uFzSjwRrAeJ85QWVLQa
---
 .github/workflows/wasm-build.yml        |    8 +
 .gitignore                              |    1 +
 tests/kicad/project-sync.spec.ts        |  154 ++-
 tests/kicad/via-snapshot-assert.spec.ts |  112 ++
 tests/web/console-copy.spec.ts          |  105 ++
 workers/cdn/package-lock.json           | 1601 +++++++++++++++++++++++
 workers/cdn/package.json                |   12 +
 workers/cdn/test/index.test.ts          |  137 ++
 8 files changed, 2127 insertions(+), 3 deletions(-)
 create mode 100644 tests/kicad/via-snapshot-assert.spec.ts
 create mode 100644 tests/web/console-copy.spec.ts
 create mode 100644 workers/cdn/package-lock.json
 create mode 100644 workers/cdn/package.json
 create mode 100644 workers/cdn/test/index.test.ts

diff --git a/.github/workflows/wasm-build.yml b/.github/workflows/wasm-build.yml
index d1a84c4..7d36479 100644
--- a/.github/workflows/wasm-build.yml
+++ b/.github/workflows/wasm-build.yml
@@ -401,6 +401,14 @@ jobs:
           npm run corpus:lint
           npm run tools:contract
 
+      # CDN worker unit tests (findings R-3: range-less GET must be 200, never 206).
+      - name: cdn worker unit tests
+        if: inputs.run_tests
+        working-directory: workers/cdn
+        run: |
+          npm ci
+          npm test
+
       # Browser binaries keyed on the lockfile (which pins the playwright version).
       # On a hit `playwright install` skips the downloads; --with-deps still
       # apt-installs its small OS dep set either way.
diff --git a/.gitignore b/.gitignore
index 4985320..243023f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,6 +38,7 @@ wxwidgets-clean/
 
 # Test artifacts
 /tests/node_modules/
+/workers/cdn/node_modules/
 /tests/playwright-report/
 /tests/test-results/
 # Baseline screenshots are a local cache fetched from R2 (tests/tools/screenshots/r2-sync.ts);
diff --git a/tests/kicad/project-sync.spec.ts b/tests/kicad/project-sync.spec.ts
index 99210e6..3db2e97 100644
--- a/tests/kicad/project-sync.spec.ts
+++ b/tests/kicad/project-sync.spec.ts
@@ -6,6 +6,7 @@ import {
     waitUntil,
     stableShot,
 } from '../e2e/utils/element-tracker';
+import { injectFromSubmodule } from './utils/fs-inject';
 
 /**
  * project-sync 0001 — "Update PCB from Schematic" in the merged WASM editor.
@@ -271,20 +272,32 @@ interface FS { mkdirTree(p: string): void; writeFile(p: string, d: string): void
 interface Mod { kicadOpenFile(p: string): unknown; }
 
 /** Stage board + schematic + minimal .kicad_pro into MEMFS, then open the board. */
-async function stageAndOpen(page: import('@playwright/test').Page, sch: string): Promise<void> {
+async function stageAndOpen(
+    page: import('@playwright/test').Page,
+    sch: string,
+    /** Runs after the project files are staged and BEFORE the board opens (e.g. lib tables). */
+    beforeOpen?: (page: import('@playwright/test').Page) => Promise<void>,
+): Promise<void> {
     await page.goto('/kicad/pcbnew.html');
     await waitForEditorReady(page);
     await page.evaluate(
         ({ dir, stem, pcb, sch, pro }) => {
-            const w = window as unknown as { FS: FS; Module: Mod };
+            const w = window as unknown as { FS: FS };
             try { w.FS.mkdirTree(dir); } catch { /* exists */ }
             w.FS.writeFile(`${dir}/${stem}.kicad_pcb`, pcb);
             w.FS.writeFile(`${dir}/${stem}.kicad_sch`, sch);
             w.FS.writeFile(`${dir}/${stem}.kicad_pro`, pro);
-            w.Module.kicadOpenFile(`${dir}/${stem}.kicad_pcb`);
         },
         { dir: DIR, stem: STEM, pcb: PCB, sch, pro: PRO },
     );
+    if (beforeOpen) await beforeOpen(page);
+    await page.evaluate(
+        ({ dir, stem }) => {
+            const w = window as unknown as { Module: Mod };
+            w.Module.kicadOpenFile(`${dir}/${stem}.kicad_pcb`);
+        },
+        { dir: DIR, stem: STEM },
+    );
     await waitUntil(
         page,
         (s: string) => document.title.includes(s),
@@ -411,3 +424,138 @@ test.describe('project-sync: update PCB from schematic (merged bundle)', () => {
             'no wasm abort during the resync flow').toBe(false);
     });
 });
+
+// ---------------------------------------------------------------------------
+// R-9 (docs/features/findings/groups/R-fixed-during-demo-record.md): the sync
+// must APPLY. The tests above prove the dialog is reached; DIALOG_UPDATE_PCB's
+// report can still say "done" while nothing lands on the board (the O-1
+// failure class the demo ledger hit). This one presses Update PCB and asserts
+// the BOARD EFFECT — the schematic's footprint exists on the board with the
+// schematic's reference — through the collab snapshot embind, never the
+// dialog text. A self-contained footprint library (the ecc83 demo's
+// footprints.pretty, staged into MEMFS with an absolute-uri project
+// fp-lib-table) makes the placement resolvable offline.
+// ---------------------------------------------------------------------------
+
+const FP_LIB_NICK = 'SyncFixture';
+const FP_NAME = 'R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal';
+const FP_LIB_DIR = `${DIR}/${FP_LIB_NICK}.pretty`;
+
+/** The schematic with the resistor pointed at the staged fixture library. */
+function resistorSchWithFixtureLib(ref: string): string {
+    return resistorSch(ref).replace('"Resistor_THT:', `"${FP_LIB_NICK}:`);
+}
+
+/** Stage the .pretty + a project fp-lib-table (absolute uri; no env expansion needed). */
+async function stageFootprintLib(page: import('@playwright/test').Page): Promise<void> {
+    await injectFromSubmodule(
+        page,
+        `kicad/demos/ecc83/footprints.pretty/${FP_NAME}.kicad_mod`,
+        `${FP_LIB_DIR}/${FP_NAME}.kicad_mod`,
+    );
+    await page.evaluate(
+        ({ dir, nick, libDir }) => {
+            const w = window as unknown as { FS: FS };
+            w.FS.writeFile(
+                `${dir}/fp-lib-table`,
+                `(fp_lib_table\n  (version 7)\n  (lib (name "${nick}")(type "KiCad")(uri "${libDir}")(options "")(descr ""))\n)\n`,
+            );
+        },
+        { dir: DIR, nick: FP_LIB_NICK, libDir: FP_LIB_DIR },
+    );
+}
+
+interface SnapMod {
+    kicadCollabSnapshot(): string;
+    kicadCollabTestItemBlob(uuid: string): string;
+}
+
+/** Click a visible wx button by label (registry coords, real mouse click — the
+ *  proven recipe from occ-export.spec.ts; a `&` mnemonic may prefix the label). */
+async function clickWxButton(page: import('@playwright/test').Page, label: string): Promise<void> {
+    const pos = await page.evaluate((wanted: string) => {
+        const el = (window.wxElementRegistry?.findAll({ visible: true }) ?? []).find(
+            (e) => (e.label === wanted || e.label === `&${wanted}`) && (e.typeName ?? '').includes('Button'),
+        );
+        return el ? { x: el.centerX, y: el.centerY } : null;
+    }, label);
+    expect(pos, `wx button "${label}" found`).not.toBeNull();
+    await page.mouse.click(pos!.x, pos!.y);
+}
+
+/** After an apply the dialog is in its "done" state (OK disabled, Close is the
+ *  default) and Escape no longer resolves it — press Close explicitly. */
+async function closeDialogByButton(page: import('@playwright/test').Page): Promise<void> {
+    await clickWxButton(page, 'Close');
+    await waitUntil(
+        page,
+        () => {
+            const r = window.wxElementRegistry;
+            return !!r && !!r.findAll && !r.findAll({ visible: true })
+                .some((e) => e.typeName === 'wxDialog');
+        },
+        'DIALOG_UPDATE_PCB closed via Close',
+        { timeout: 30000 },
+    );
+}
+
+/** References of every footprint currently on the board (from the item blobs). */
+async function boardFootprintRefs(page: import('@playwright/test').Page): Promise<string[]> {
+    return page.evaluate(() => {
+        const m = (window as unknown as { Module: SnapMod }).Module;
+        const snap = JSON.parse(m.kicadCollabSnapshot()) as { added: Array<{ id: string; type: string }> };
+        return snap.added
+            .filter((i) => i.type === 'FOOTPRINT')
+            .map((i) => /\(property "Reference" "([^"]*)"/.exec(m.kicadCollabTestItemBlob(i.id))?.[1] ?? '?');
+    });
+}
+
+/** Press Update PCB and wait until the board carries exactly the expected references. */
+async function updateAndExpectRefs(page: import('@playwright/test').Page, refs: string[]): Promise<void> {
+    await clickWxButton(page, 'Update PCB');
+    await expect
+        .poll(() => boardFootprintRefs(page), {
+            message: `board footprints after Update PCB should be ${JSON.stringify(refs)}`,
+            timeout: 60000,
+            intervals: [500],
+        })
+        .toEqual(refs);
+}
+
+test.describe('project-sync: Update PCB applies to the board (R-9)', () => {
+    test('the schematic footprint lands on the board, and a re-sync tracks a reference change', async ({ page }) => {
+        test.setTimeout(240000);
+        const consoleLines: string[] = [];
+        page.on('console', (m) => consoleLines.push(m.text()));
+        page.on('pageerror', (e) => consoleLines.push(`pageerror: ${e.message}`));
+
+        await stageAndOpen(page, resistorSchWithFixtureLib('R777'), stageFootprintLib);
+        await page.waitForFunction(
+            () => {
+                const m = (window as unknown as { Module?: Partial<SnapMod> }).Module;
+                return typeof m?.kicadCollabSnapshot === 'function'
+                    && typeof m?.kicadCollabTestItemBlob === 'function';
+            },
+            null,
+            { timeout: 30000 },
+        );
+        expect(await boardFootprintRefs(page), 'board starts empty').toEqual([]);
+
+        // First sync: the effect, not the report.
+        await openSyncDialog(page);
+        await updateAndExpectRefs(page, ['R777']);
+        await assertSchFrameHidden(page);
+        await closeDialogByButton(page);
+
+        // The schematic changes underneath (live sibling restage) — re-sync must
+        // apply the NEW reference, not a cached parse.
+        await rewriteSchematic(page, resistorSchWithFixtureLib('R888'));
+        await openSyncDialog(page);
+        await updateAndExpectRefs(page, ['R888']);
+        await assertSchFrameHidden(page);
+        await closeDialogByButton(page);
+
+        expect(consoleLines.some((s) => s.includes('Aborted(')),
+            'no wasm abort during the apply flow').toBe(false);
+    });
+});
diff --git a/tests/kicad/via-snapshot-assert.spec.ts b/tests/kicad/via-snapshot-assert.spec.ts
new file mode 100644
index 0000000..6571984
--- /dev/null
+++ b/tests/kicad/via-snapshot-assert.spec.ts
@@ -0,0 +1,112 @@
+import { test, expect, type Page } from "./fixtures";
+import { execSync } from "child_process";
+import * as path from "path";
+
+/**
+ * repro for R-2 (docs/features/findings/groups/R-fixed-during-demo-record.md)
+ *
+ * `itemToJson` (wasm/bindings/pcbnew_embind.cpp) once called the layerless
+ * virtual `PCB_VIA::GetWidth()` — since the padstack refactor that is a
+ * wxCHECK trap ("Warning: PCB_VIA::GetWidth called without a layer argument",
+ * pcbnew/pcb_track.cpp) — once per via per snapshot. The value came back
+ * right (the wxCHECK's fallback IS the ALL_LAYERS slot), so no spec noticed;
+ * on a big board every collab baseline/snapshot was an assert storm in the
+ * console. The fix passes `PADSTACK::ALL_LAYERS`.
+ *
+ * Oracle: the wx assert line in the console (the wasm build logs asserts via
+ * wxMessageOutputDebug and continues — wxTrap is a no-op there), plus the
+ * via width itself. Harness: pcbnew-collab.html (wizard-skipping seed), a
+ * two-via board written into MEMFS.
+ */
+
+const VIA1 = "aaaaaaaa-0000-4000-8000-00000000c001";
+const VIA2 = "aaaaaaaa-0000-4000-8000-00000000c002";
+
+const VIA_PCB = `(kicad_pcb
+\t(version 20241229)
+\t(generator "pcbnew")
+\t(generator_version "9.0")
+\t(general (thickness 1.6))
+\t(paper "A4")
+\t(layers
+\t\t(0 "F.Cu" signal)
+\t\t(2 "B.Cu" signal)
+\t\t(25 "Edge.Cuts" user)
+\t)
+\t(setup)
+\t(net 0 "")
+\t(via (at 80 80) (size 1.4) (drill 0.6) (layers "F.Cu" "B.Cu") (net 0) (uuid "${VIA1}"))
+\t(via (at 90 80) (size 0.8) (drill 0.4) (layers "F.Cu" "B.Cu") (net 0) (uuid "${VIA2}"))
+)
+`;
+
+const VIA_WIDTH_ASSERT =
+  /PCB_VIA::GetWidth called without a layer argument|assert "false" failed in GetWidth\(\)/;
+
+interface FS { mkdirTree(p: string): void; writeFile(p: string, d: string): void; }
+interface Mod { kicadOpenFile(p: string): unknown; kicadCollabSnapshot(): string; }
+
+async function bootAndOpen(page: Page): Promise<void> {
+  await page.goto("/kicad/pcbnew-collab.html");
+  await expect(page.locator("#canvas")).toBeVisible({ timeout: 90000 });
+  await page.waitForFunction(
+    () => {
+      const m = (window as unknown as { Module?: Partial<Mod> }).Module;
+      return typeof m?.kicadOpenFile === "function" && typeof m?.kicadCollabSnapshot === "function";
+    },
+    null,
+    { timeout: 90000 },
+  );
+  await page.waitForFunction(
+    () =>
+      !!window.wxElementRegistry &&
+      window.wxElementRegistry
+        .findAll({ visible: true })
+        .some((e) => /Frame$/.test(e.typeName) || (e.name || "").endsWith("Frame")),
+    null,
+    { timeout: 90000 },
+  );
+  await page.evaluate((content) => {
+    const w = window as unknown as { FS: FS; Module: Mod };
+    const dir = "/home/kicad/documents";
+    try { w.FS.mkdirTree(dir); } catch { /* exists */ }
+    const p = `${dir}/vias.kicad_pcb`;
+    w.FS.writeFile(p, content);
+    w.Module.kicadOpenFile(p);
+  }, VIA_PCB);
+  await expect.poll(() => page.title(), { timeout: 30000 }).toMatch(/vias/i);
+}
+
+test.beforeAll(() => {
+  execSync("node collab/build.mjs", { cwd: path.resolve(__dirname, ".."), stdio: "inherit" });
+});
+
+test("snapshotting a board with vias emits their width without a GetWidth assert (R-2)", async ({
+  page,
+  testLogger,
+}) => {
+  test.setTimeout(180000);
+  await bootAndOpen(page);
+
+  // Several snapshots: pre-fix this was one assert PER VIA PER SNAPSHOT.
+  const snaps = await page.evaluate(() => {
+    const m = (window as unknown as { Module: Mod }).Module;
+    return [0, 1, 2].map(() => JSON.parse(m.kicadCollabSnapshot()));
+  });
+  const last = snaps[snaps.length - 1] as { added: Array<{ id: string; type: string; width?: number; drill?: number }> };
+  const byId = new Map(last.added.map((i) => [i.id, i]));
+
+  for (const [id, mm] of [[VIA1, 1.4], [VIA2, 0.8]] as const) {
+    const via = byId.get(id);
+    expect(via, `via ${id} present in snapshot`).toBeTruthy();
+    expect(via!.type).toBe("PCB_VIA");
+    // internal units are nm; the (size …) is the whole-stack width.
+    expect(via!.width, `via ${id} width`).toBe(Math.round(mm * 1_000_000));
+    expect(via!.drill, `via ${id} drill`).toBeGreaterThan(0);
+  }
+
+  const assertLines = [...testLogger.consoleLogs, ...testLogger.errors].filter((l) =>
+    VIA_WIDTH_ASSERT.test(l),
+  );
+  expect(assertLines, "no PCB_VIA::GetWidth assert in the console").toEqual([]);
+});
diff --git a/tests/web/console-copy.spec.ts b/tests/web/console-copy.spec.ts
new file mode 100644
index 0000000..87ac22b
--- /dev/null
+++ b/tests/web/console-copy.spec.ts
@@ -0,0 +1,105 @@
+import { test, expect, type Page } from '@playwright/test';
+
+/**
+ * repro for R-4 (docs/features/findings/groups/R-fixed-during-demo-record.md)
+ *
+ * wx's window-level keydown handler forwards every non-printable chord to the
+ * wasm app and `preventDefault`s it (wxwidgets/src/wasm/app.cpp,
+ * `preventDefault = !KeyEventIsPlainPrintable(...)`). Ctrl/Cmd+C is such a
+ * chord, so the browser's native "copy selection" never ran: log text in the
+ * console panel could be selected but not copied. WasmTool now intercepts the
+ * chord in the CAPTURE phase when the selection lives in the console and stops
+ * propagation, so the default copy fires; and a canvas pointerdown collapses a
+ * stale console selection so it cannot steal the editor's own Ctrl+C.
+ *
+ * Oracle: a `copy` event on the document. Cancelling the keydown suppresses
+ * the copy default, so with the guard removed no `copy` event fires. Engine-
+ * neutral (no clipboard-read permission needed). The chord is ControlOrMeta+C:
+ * headless engines honour the HOST platform's copy accelerator (Meta on a mac
+ * dev box, Control on Linux CI) regardless of the device UA — a plain
+ * Control+C never copies on macOS (probed on both engines). The guard checks
+ * metaKey || ctrlKey, so either spelling exercises it.
+ */
+
+const SCOPE = 'default';
+
+async function bootBoard(page: Page): Promise<void> {
+  await page.goto(`/${SCOPE}/projects/demo/demo.kicad_pcb?user=copy-probe`);
+  await expect(page.locator('#canvas')).toBeVisible({ timeout: 120000 });
+  await expect
+    .poll(() => page.title(), {
+      message: 'editor never reached the expected title',
+      timeout: 120000,
+      intervals: [1000],
+    })
+    .toMatch(/demo — PCB Editor/i);
+}
+
+test('Ctrl+C copies a console-log selection instead of being eaten by wx', async ({ page }) => {
+  test.setTimeout(300000); // one full pcbnew wasm boot
+
+  await bootBoard(page);
+
+  // Open the console footer (closed state is the "console (N)" tab).
+  await page.getByRole('button', { name: /console \(/ }).first().click();
+  const log = page.locator('pre.select-text');
+  await expect(log).toBeVisible({ timeout: 10000 });
+  await expect.poll(() => log.innerText()).not.toBe('');
+
+  // Select the log text and arm the oracle.
+  await page.evaluate(() => {
+    const w = window as unknown as { __copyFired: number; __keydownPrevented: boolean | null };
+    w.__copyFired = 0;
+    w.__keydownPrevented = null;
+    document.addEventListener('copy', () => { w.__copyFired++; });
+    // Bubble-phase listener on window = after wx's handler; records whether the
+    // chord's default was cancelled (the failure mode).
+    // Diagnostics (window capture = same node as the guard, fires after it;
+    // document capture = only reachable if the guard did NOT stop propagation).
+    const d = window as unknown as { __diag: Record<string, unknown> };
+    d.__diag = { winCapture: 0, docCapture: 0, docPreventedAtBubble: null as boolean | null };
+    window.addEventListener('keydown', (e) => {
+      if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'c') {
+        (d.__diag.winCapture as number)++;
+        d.__diag.active = document.activeElement?.tagName + '#' + (document.activeElement?.id || '');
+      }
+    }, true);
+    document.addEventListener('keydown', (e) => {
+      if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'c') (d.__diag.docCapture as number)++;
+    }, true);
+    document.addEventListener('keydown', (e) => {
+      if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'c') d.__diag.docPreventedAtBubble = e.defaultPrevented;
+    });
+    const pre = document.querySelector('pre.select-text');
+    if (!pre) throw new Error('console <pre> not found');
+    const range = document.createRange();
+    range.selectNodeContents(pre);
+    const sel = window.getSelection();
+    sel?.removeAllRanges();
+    sel?.addRange(range);
+  });
+  expect(await page.evaluate(() => window.getSelection()?.isCollapsed)).toBe(false);
+
+  await page.keyboard.press('ControlOrMeta+c');
+  console.log('[R-4 diag]', JSON.stringify(await page.evaluate(() => (window as unknown as { __diag: unknown }).__diag)));
+
+  await expect
+    .poll(() => page.evaluate(() => (window as unknown as { __copyFired: number }).__copyFired), {
+      message: 'no copy event — wx swallowed Ctrl+C with the selection in the console',
+      timeout: 5000,
+    })
+    .toBeGreaterThan(0);
+
+  // A canvas pointerdown collapses the console selection (wx preventDefaults the
+  // native collapse), so a stale log selection cannot keep stealing Ctrl+C.
+  await page.evaluate(() => {
+    const c = document.querySelector('#canvas') as HTMLCanvasElement;
+    c.dispatchEvent(new PointerEvent('pointerdown', { bubbles: true, cancelable: true, clientX: 10, clientY: 10 }));
+  });
+  await expect
+    .poll(() => page.evaluate(() => window.getSelection()?.isCollapsed ?? true), {
+      message: 'console selection should collapse on canvas pointerdown',
+      timeout: 5000,
+    })
+    .toBe(true);
+});
diff --git a/workers/cdn/package-lock.json b/workers/cdn/package-lock.json
new file mode 100644
index 0000000..286c9d4
--- /dev/null
+++ b/workers/cdn/package-lock.json
@@ -0,0 +1,1601 @@
+{
+  "name": "pcbjam-cdn-worker",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "pcbjam-cdn-worker",
+      "devDependencies": {
+        "vitest": "^3.0.0"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.28.2",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.28.2.tgz",
+      "integrity": "sha512-XExcO+dvLKvVtNTibSTBej1NCAbaGhWn9Ww1ZPx80qsahhPFe/8jgWP0IchNe0F3HwkU7n8ejhH8bjonqht8mQ==",
+      "cpu": [
+        "ppc64"
+      ],
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+      },
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+        "url": "https://opencollective.com/vitest"
+      }
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+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-3.2.7.tgz",
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+      "license": "MIT",
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+        "@vitest/expect": "3.2.7",
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+        "@vitest/pretty-format": "^3.2.7",
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+        "debug": "^4.4.1",
+        "expect-type": "^1.2.1",
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+        "tinyrainbow": "^2.0.0",
+        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0",
+        "vite-node": "3.2.4",
+        "why-is-node-running": "^2.3.0"
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+      "bin": {
+        "vitest": "vitest.mjs"
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+          "optional": true
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+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
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+        "jsdom": {
+          "optional": true
+        }
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+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    }
+  }
+}
diff --git a/workers/cdn/package.json b/workers/cdn/package.json
new file mode 100644
index 0000000..39108bb
--- /dev/null
+++ b/workers/cdn/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "pcbjam-cdn-worker",
+  "private": true,
+  "type": "module",
+  "description": "Static CDN worker (R2-backed) — unit tests only; deployed via wrangler from CI.",
+  "scripts": {
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "vitest": "^3.0.0"
+  }
+}
diff --git a/workers/cdn/test/index.test.ts b/workers/cdn/test/index.test.ts
new file mode 100644
index 0000000..0c04c76
--- /dev/null
+++ b/workers/cdn/test/index.test.ts
@@ -0,0 +1,137 @@
+// repro for R-3 (docs/features/findings/groups/R-fixed-during-demo-record.md)
+//
+// The CDN worker once stamped EVERY range-less GET as `206 Partial Content`:
+// current workerd reports a DEFINED `object.range` (full span) even for a
+// range-less `bucket.get()`, and the worker gated 206 on `object.range`.
+// Chrome shrugs at a 206 <script>; Firefox fires onload but refuses to
+// execute it, so every Firefox boot on staging died ("runtime did not
+// initialize (no FS)"). The fix gates 206 on the REQUEST's Range header and
+// only passes a range option to `get()` when one was asked for.
+//
+// The bucket stub below reproduces the workerd behaviour that caused the bug
+// (always-defined `range`), so the pre-fix code path yields 206 here.
+import { describe, expect, it } from "vitest";
+import worker from "../src/index.ts";
+
+type GetCall = { key: string; options: unknown };
+
+function stubBucket(opts: {
+  size?: number;
+  contentEncoding?: string;
+  missing?: boolean;
+  etag?: string;
+}) {
+  const size = opts.size ?? 1000;
+  const etag = opts.etag ?? '"etag-1"';
+  const calls: GetCall[] = [];
+  const bucket = {
+    calls,
+    async get(key: string, options: { range?: Headers | { offset?: number; length?: number } } = {}) {
+      calls.push({ key, options });
+      if (opts.missing) return null;
+
+      // workerd: `range` is DEFINED (full span) even when no range was asked.
+      let range: { offset: number; length: number } = { offset: 0, length: size };
+      const r = options.range;
+      if (r instanceof Headers) {
+        const m = /^bytes=(\d+)-(\d*)$/.exec(r.get("Range") ?? "");
+        if (m) {
+          const offset = Number(m[1]);
+          const end = m[2] === "" ? size - 1 : Number(m[2]);
+          range = { offset, length: end - offset + 1 };
+        }
+      } else if (r && typeof r === "object") {
+        range = { offset: r.offset ?? 0, length: r.length ?? size - (r.offset ?? 0) };
+      }
+
+      return {
+        size,
+        range,
+        httpEtag: etag,
+        body: new ReadableStream({
+          start(c) {
+            c.enqueue(new Uint8Array(range.length));
+            c.close();
+          },
+        }),
+        writeHttpMetadata(h: Headers) {
+          h.set("Content-Type", "text/javascript");
+          if (opts.contentEncoding) h.set("Content-Encoding", opts.contentEncoding);
+        },
+      };
+    },
+  };
+  return bucket;
+}
+
+const env = (bucket: ReturnType<typeof stubBucket>) => ({ BUCKET: bucket as never });
+const req = (path: string, init: RequestInit = {}) =>
+  new Request(`https://cdn.example${path}`, init);
+
+describe("cdn worker — range-less GET is a 200, never a 206 (R-3)", () => {
+  it("plain GET → 200 with the full Content-Length and no Content-Range", async () => {
+    const bucket = stubBucket({ size: 1234, contentEncoding: "br" });
+    const res = await worker.fetch(req("/v1/kicad_editor.js"), env(bucket));
+
+    expect(res.status).toBe(200);
+    expect(res.headers.get("Content-Range")).toBeNull();
+    expect(res.headers.get("Content-Length")).toBe("1234");
+    expect(res.headers.get("Accept-Ranges")).toBe("bytes");
+    // Pre-compressed body: the stored encoding must survive to the client.
+    expect(res.headers.get("Content-Encoding")).toBe("br");
+    expect(res.headers.get("ETag")).toBe('"etag-1"');
+    expect(res.headers.get("X-Content-Type-Options")).toBe("nosniff");
+
+    // No range option reaches the bucket for a range-less request.
+    expect(bucket.calls).toHaveLength(1);
+    expect(bucket.calls[0]!.key).toBe("v1/kicad_editor.js");
+    expect(bucket.calls[0]!.options).toEqual({});
+  });
+
+  it("GET with a Range header → 206 with the matching Content-Range", async () => {
+    const bucket = stubBucket({ size: 1000 });
+    const res = await worker.fetch(
+      req("/v1/a.wasm", { headers: { Range: "bytes=10-19" } }),
+      env(bucket),
+    );
+
+    expect(res.status).toBe(206);
+    expect(res.headers.get("Content-Range")).toBe("bytes 10-19/1000");
+    expect(res.headers.get("Content-Length")).toBe("10");
+    // The request headers were forwarded as the range option.
+    const opt = bucket.calls[0]!.options as { range?: unknown };
+    expect(opt.range).toBeInstanceOf(Headers);
+  });
+
+  it("HEAD → same headers, no body", async () => {
+    const bucket = stubBucket({ size: 77 });
+    const res = await worker.fetch(req("/v1/a.js", { method: "HEAD" }), env(bucket));
+    expect(res.status).toBe(200);
+    expect(res.headers.get("Content-Length")).toBe("77");
+    expect(res.body).toBeNull();
+  });
+
+  it("If-None-Match hit → 304", async () => {
+    const bucket = stubBucket({ etag: '"e2"' });
+    const res = await worker.fetch(
+      req("/v1/a.js", { headers: { "If-None-Match": '"e2"' } }),
+      env(bucket),
+    );
+    expect(res.status).toBe(304);
+  });
+
+  it("missing key → 404; percent-encoded keys are decoded", async () => {
+    const bucket = stubBucket({ missing: true });
+    const res = await worker.fetch(req("/v1/my%20lib.kicad_sym"), env(bucket));
+    expect(res.status).toBe(404);
+    expect(bucket.calls[0]!.key).toBe("v1/my lib.kicad_sym");
+  });
+
+  it("non-GET methods → 405; OPTIONS → 204 with CORS allowances", async () => {
+    const bucket = stubBucket({});
+    expect((await worker.fetch(req("/x", { method: "POST" }), env(bucket))).status).toBe(405);
+    const opt = await worker.fetch(req("/x", { method: "OPTIONS" }), env(bucket));
+    expect(opt.status).toBe(204);
+    expect(opt.headers.get("Access-Control-Allow-Headers")).toContain("Range");
+  });
+});