diff --git a/.github/workflows/bootstrap-release.yml b/.github/workflows/bootstrap-release.yml
index 09c7d786..4f569c57 100644
--- a/.github/workflows/bootstrap-release.yml
+++ b/.github/workflows/bootstrap-release.yml
@@ -84,6 +84,8 @@ jobs:
         run: bun run test:coverage
       - name: Browser smoke tests
         run: bun run test:browser
+      - name: Remove generated delivery-size evidence
+        run: git restore --worktree -- test-results/delivery-size/size-report.json
       - name: Assert source remains clean
         run: test -z "$(git status --porcelain --untracked-files=all)"
 
diff --git a/scripts/release-workflow.test.ts b/scripts/release-workflow.test.ts
index 4f138389..d7d2cf09 100644
--- a/scripts/release-workflow.test.ts
+++ b/scripts/release-workflow.test.ts
@@ -7,6 +7,7 @@ import { PUBLISHABLE_PACKAGE_ORDER } from "./workspace-tooling.js";
 
 const repositoryRoot = resolve(import.meta.dir, "..");
 const workflowPath = resolve(repositoryRoot, ".github/workflows/release.yml");
+const bootstrapWorkflowPath = resolve(repositoryRoot, ".github/workflows/bootstrap-release.yml");
 
 type Step = { name?: string; run?: string; uses?: string; with?: Record<string, unknown> };
 type Job = {
@@ -43,6 +44,21 @@ function artifact(name: string): ReleasePackageArtifact {
   };
 }
 
+describe("bootstrap release workflow", () => {
+  it("removes generated size evidence before enforcing a clean source tree", async () => {
+    const source = await readFile(bootstrapWorkflowPath, "utf8");
+    const qualityGate = source.indexOf("bun run verify:release-quality");
+    const restore = source.indexOf(
+      "git restore --worktree -- test-results/delivery-size/size-report.json",
+    );
+    const cleanGate = source.indexOf('test -z "$(git status --porcelain --untracked-files=all)"');
+
+    expect(qualityGate).toBeGreaterThan(-1);
+    expect(restore).toBeGreaterThan(qualityGate);
+    expect(cleanGate).toBeGreaterThan(restore);
+  });
+});
+
 describe("stage-only release workflow", () => {
   it("requires an exact commit and version and serializes release runs", async () => {
     const { parsed } = await workflow();
diff --git a/scripts/size-report.ts b/scripts/size-report.ts
index 38106d6d..cc6a7bcb 100644
--- a/scripts/size-report.ts
+++ b/scripts/size-report.ts
@@ -975,6 +975,7 @@ async function writeReport(report: SizeReport): Promise<void> {
   await mkdir(dirname(reportPath), { recursive: true });
   await rm(join(evidenceRoot, "failure.json"), { force: true });
   await writeFile(reportPath, `${JSON.stringify(report, null, 2)}\n`);
+  await runCommand(["bunx", "biome", "format", "--write", reportPath]);
 }
 
 async function writeFailure(error: unknown): Promise<void> {