test(v5-g16): cross-arch 9 non-canonical presets — 18 e2e cells

Closes V5-G16 / cppmega-mlx-3va. V4-12 used hardcoded {preset}_mlp /
{preset}_attn pattern and skipped presets whose brick factories named
them differently. v5 supplies explicit mlpId/attnId per preset:

  glm_45            → glm_45_shared / glm_45_attn
  glm_45_air        → glm_45_air_shared / glm_45_air_attn
  glm_47            → glm_47_shared / glm_47_attn
  intellect_3       → intellect_3_shared / intellect_3_attn
  qwen3_dense_0_6b  → qwen3_0_6b_mlp / qwen3_0_6b_attn
  qwen3_dense_32b   → qwen3_32b_mlp / qwen3_32b_attn
  qwen3_dense_4b    → qwen3_4b_mlp / qwen3_4b_attn
  qwen3_dense_8b    → qwen3_8b_mlp / qwen3_8b_attn
  sarvam_30b        → sarvam_30b_shared / sarvam_30b_attn

9 presets × 2 mutations (activation→swiglu, pre_norm→layernorm)
= 18 cells. Combined with V4-12's 10 canonical-named presets that
brings cross-arch deep-verify coverage to 19/19 mlp+attn presets.

18/18 green in 19.2s.

Author: apstenku123

vbgui/e2e/scenarios/45_cross_arch_non_canonical.spec.ts

@@ -0,0 +1,58 @@
+// G16: cross-arch coverage for presets whose brick names don't follow
+// `{preset}_mlp` / `{preset}_attn` convention. V4-12 hardcoded the
+// canonical pattern and skipped these 9. v5 supplies explicit
+// mlp_id / attn_id per preset.
+
+import { test, expect } from "@playwright/test";
+import { gotoApp, selectPreset, clickRunPipeline, closeModal } from "../fixtures";
+import { readTrainExtras } from "../utils/train_extras";
+
+interface Entry { preset: string; mlpId: string; attnId: string; }
+
+const ENTRIES: Entry[] = [
+  { preset: "glm_45",            mlpId: "glm_45_shared",     attnId: "glm_45_attn" },
+  { preset: "glm_45_air",        mlpId: "glm_45_air_shared", attnId: "glm_45_air_attn" },
+  { preset: "glm_47",            mlpId: "glm_47_shared",     attnId: "glm_47_attn" },
+  { preset: "intellect_3",       mlpId: "intellect_3_shared",attnId: "intellect_3_attn" },
+  { preset: "qwen3_dense_0_6b",  mlpId: "qwen3_0_6b_mlp",    attnId: "qwen3_0_6b_attn" },
+  { preset: "qwen3_dense_32b",   mlpId: "qwen3_32b_mlp",     attnId: "qwen3_32b_attn" },
+  { preset: "qwen3_dense_4b",    mlpId: "qwen3_4b_mlp",      attnId: "qwen3_4b_attn" },
+  { preset: "qwen3_dense_8b",    mlpId: "qwen3_8b_mlp",      attnId: "qwen3_8b_attn" },
+  { preset: "sarvam_30b",        mlpId: "sarvam_30b_shared", attnId: "sarvam_30b_attn" },
+];
+
+for (const { preset, mlpId, attnId } of ENTRIES) {
+  test(`G16: ${preset} activation mutation propagates`, async ({ page }) => {
+    test.setTimeout(60_000);
+    await gotoApp(page);
+    await selectPreset(page, preset);
+    await page.locator(`[data-testid='brick-node-${mlpId}']`).click();
+    const panel = page.getByTestId(`brick-context-${mlpId}`);
+    await expect(panel).toBeVisible({ timeout: 4_000 });
+    await page.locator(`[data-testid='brick-context-${mlpId}-activation']`)
+      .selectOption("swiglu");
+    await page.locator(`[data-testid='brick-context-${mlpId}-apply']`).click();
+    await clickRunPipeline(page, "train");
+    const extras = await readTrainExtras(page);
+    expect(extras.model_summary.mlp_activation).toBe("swiglu");
+    expect(extras.weight_delta_norm).toBeGreaterThan(0);
+    await closeModal(page);
+  });
+
+  test(`G16: ${preset} pre_norm mutation propagates`, async ({ page }) => {
+    test.setTimeout(60_000);
+    await gotoApp(page);
+    await selectPreset(page, preset);
+    await page.locator(`[data-testid='brick-node-${attnId}']`).click();
+    const panel = page.getByTestId(`brick-context-${attnId}`);
+    await expect(panel).toBeVisible({ timeout: 4_000 });
+    await page.locator(`[data-testid='brick-context-${attnId}-pre-norm']`)
+      .selectOption("layernorm");
+    await page.locator(`[data-testid='brick-context-${attnId}-apply']`).click();
+    await clickRunPipeline(page, "train");
+    const extras = await readTrainExtras(page);
+    expect(extras.model_summary.attention_pre_norm).toBe("layernorm");
+    expect(extras.weight_delta_norm).toBeGreaterThan(0);
+    await closeModal(page);
+  });
+}