fix(release): recover immutable patch validation gates

config/scripts/release-e2e-dispatch-contract.test.mjs

@@ -10,6 +10,17 @@ const releaseWorkflow = parse(
 const e2eWorkflow = parse(readFileSync(join(projectDir, '.github/workflows/e2e.yml'), 'utf8'))
 
 describe('release E2E dispatch contract', () => {
+  it('validates immutable tags with the current golden test harness', () => {
+    const restoreStep = releaseWorkflow.jobs['terminal-rendering-golden'].steps.find(
+      (step) => step.name === 'Restore golden test harness from the workflow ref'
+    )
+
+    expect(restoreStep.env.WORKFLOW_SHA).toBe('${{ github.workflow_sha }}')
+    expect(restoreStep.run).toContain('git fetch --no-tags --depth=1 origin "$WORKFLOW_SHA"')
+    expect(restoreStep.run).toContain('golden-source-control-open-diff.spec.ts')
+    expect(restoreStep.run).toContain('golden-terminal-file-link.spec.ts')
+  })
+
   it('dispatches tag-scoped E2E only after publication', () => {
     const dispatchJob = releaseWorkflow.jobs['post-release-e2e']
     const dispatchStep = dispatchJob.steps.find((step) => step.name === 'Dispatch tag-scoped E2E')

config/scripts/skill-sharing-release-workflow.test.mjs

@@ -44,6 +44,30 @@ describe('skill-sharing release workflow', () => {
     expect(command).toContain('src/shared/skill-bundle-install-contract.test.ts')
   })
 
+  it('installs the archive tool required by Electron on the Linux floor', () => {
+    const linux = workflow.jobs['skill-sharing-linux-floor-release-gate']
+    const prerequisites = stepNamed(linux, 'Install Ubuntu 20.04 prerequisites')
+
+    expect(prerequisites.run).toMatch(/apt-get install[^\n]*\bunzip\b/)
+  })
+
+  it('validates immutable tags with the current skill-sharing test harness', () => {
+    for (const jobName of [
+      'skill-sharing-release-gate',
+      'skill-sharing-linux-floor-release-gate'
+    ]) {
+      const restore = stepNamed(
+        workflow.jobs[jobName],
+        'Restore skill-sharing test harness from the workflow ref'
+      )
+
+      expect(restore.env.WORKFLOW_SHA).toBe('${{ github.workflow_sha }}')
+      expect(restore.run).toContain('git fetch --no-tags --depth=1 origin "$WORKFLOW_SHA"')
+      expect(restore.run).toContain('skill-freshness-inventory.test.ts')
+      expect(restore.run).toContain('skill-provider-runtime-roots.test.ts')
+    }
+  })
+
   it('archives bounded machine-readable evidence from every platform', () => {
     for (const jobName of [
       'skill-sharing-release-gate',