diff --git a/package.json b/package.json
index 4a4c793..7f12e40 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,9 @@
     "test:integration": "npm run test:integration -w imhotep-playwright",
     "test:e2e": "npm run test:e2e -w imhotep-fixtures",
     "test:external-smoke": "node scripts/external-smoke.mjs",
+    "test:structural": "node scripts/check-structural.js",
+    "test:structural:fix": "node scripts/check-structural.js --fix-baseline",
+    "ci:verify": "bash scripts/ci-verify.sh",
     "lint": "eslint packages/*/src/**/*.ts",
     "clean": "rm -rf packages/*/dist packages/*/*.tsbuildinfo dist && find packages -path '*/src/*.js' -delete && find packages -path '*/src/*.d.ts' -delete && find packages -path '*/src/*.map' -delete"
   },
diff --git a/packages/imhotep-core/src/geometry-cache.test.ts b/packages/imhotep-core/src/geometry-cache.test.ts
index df98a5d..f150cb1 100644
--- a/packages/imhotep-core/src/geometry-cache.test.ts
+++ b/packages/imhotep-core/src/geometry-cache.test.ts
@@ -13,6 +13,7 @@ import {
   clearGeometryCache,
   readCachedExtractionResult,
   writeCachedExtractionResult,
+  WORLD_CACHE_SCHEMA_VERSION,
 } from './geometry-cache.js'
 import { createEmptyWorld } from './world.js'
 import type { GeometryWorld } from './world.js'
@@ -319,4 +320,10 @@ describe('geometry cache', () => {
       rmSync(cacheDir, { recursive: true, force: true })
     }
   })
+
+  test('cache key includes schema version for auto-invalidation', () => {
+    const key = computeGeometryCacheKey('https://example.com', ['.a'], { viewportWidth: 1280 })
+    assert.ok(key.startsWith(`${WORLD_CACHE_SCHEMA_VERSION}-`),
+      `cache key "${key}" should start with schema version ${WORLD_CACHE_SCHEMA_VERSION}`)
+  })
 })
diff --git a/scripts/.structural-baseline.json b/scripts/.structural-baseline.json
new file mode 100644
index 0000000..26cb708
--- /dev/null
+++ b/scripts/.structural-baseline.json
@@ -0,0 +1,5 @@
+{
+  "asAny": 101,
+  "emptyCatch": 17,
+  "nullishZero": 62
+}
diff --git a/scripts/check-structural.js b/scripts/check-structural.js
new file mode 100644
index 0000000..7203d65
--- /dev/null
+++ b/scripts/check-structural.js
@@ -0,0 +1,109 @@
+/**
+ * Structural conformance gate.
+ *
+ * Counts production-source code-smells and compares against committed baselines.
+ * Nonzero exit code = a baseline was violated.  The script does NOT alter
+ * files; it only audits and reports.
+ *
+ * Usage: node scripts/check-structural.js [--fix-baseline]
+ */
+
+import { readFileSync, writeFileSync } from 'fs'
+import { fileURLToPath } from 'url'
+import glob from 'glob'
+import path from 'path'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const ROOT = path.resolve(__dirname, '..')
+const BASELINE_PATH = path.join(ROOT, 'scripts', '.structural-baseline.json')
+
+const PACKAGE_DIRS = glob.sync('packages/*', { cwd: ROOT, absolute: true })
+  .filter(d => !d.match(/(imhotep-fixtures|imhotep-bench|imhotep-cli)$/))
+
+function srcFiles(pkgDir) {
+  return glob.sync('src/**/*.ts', { cwd: pkgDir, absolute: true })
+    .filter(f => !f.endsWith('.test.ts') && !f.endsWith('.d.ts'))
+}
+
+function countPattern(files, pattern, excludeComment = false) {
+  let count = 0
+  const locations = []
+  for (const f of files) {
+    const lines = readFileSync(f, 'utf8').split('\n')
+    for (let i = 0; i < lines.length; i++) {
+      const line = lines[i]
+      if (excludeComment && line.trim().startsWith('//')) continue
+      const matches = line.match(pattern)
+      if (matches) {
+        count += matches.length
+        locations.push(`${path.relative(ROOT, f)}:${i + 1}`)
+      }
+    }
+  }
+  return { count, locations }
+}
+
+const allFiles = PACKAGE_DIRS.flatMap(d => srcFiles(d))
+const pkgNames = PACKAGE_DIRS.map(d => path.basename(d))
+
+const violations = {
+  asAny: countPattern(allFiles, /\bas any\b/g, true),
+  emptyCatch: countPattern(allFiles, /\bcatch\s*\{/),
+  nullishZero: countPattern(allFiles, /\?\?\s*0(?![.\d])/, true),
+}
+
+const baseline = (() => {
+  try { return JSON.parse(readFileSync(BASELINE_PATH, 'utf8')) }
+  catch { return {} }
+})()
+
+const results = {
+  timestamp: new Date().toISOString(),
+  packages: pkgNames,
+  violations,
+  baseline,
+}
+
+const errors = []
+
+for (const [key, current] of Object.entries(violations)) {
+  const allowed = baseline[key] ?? 0
+  const delta = current.count - allowed
+  const status = delta <= 0 ? 'PASS' : 'FAIL'
+  const msg = `  ${key.padEnd(18)} current=${String(current.count).padStart(3)}  baseline=${String(allowed).padStart(3)}  delta=${String(delta).padStart(4)}  ${status}`
+  console.log(msg)
+  if (status === 'FAIL') {
+    errors.push(`${key} (${current.count} > baseline ${allowed})`)
+    console.log(`    New locations:`)
+    for (const loc of current.locations.slice(0, 10)) {
+      console.log(`      ${loc}`)
+    }
+    if (current.locations.length > 10) {
+      console.log(`      ... and ${current.locations.length - 10} more`)
+    }
+  }
+}
+
+const fixBaseline = process.argv.includes('--fix-baseline')
+if (fixBaseline) {
+  const newBaseline = {}
+  for (const [key, v] of Object.entries(violations)) {
+    newBaseline[key] = v.count
+  }
+  writeFileSync(BASELINE_PATH, JSON.stringify(newBaseline, null, 2) + '\n')
+  console.log(`\n  Baseline written to ${path.relative(ROOT, BASELINE_PATH)}`)
+  console.log('Structural gate PASSED (baseline updated)')
+  process.exit(0)
+}
+
+writeFileSync(BASELINE_PATH, JSON.stringify(baseline, null, 2) + '\n')
+
+if (errors.length > 0) {
+  console.error(`\nStructural gate FAILED (${errors.length} violation(s)):`)
+  for (const e of errors) console.error(`  - ${e}`)
+  console.error(`\nIf these are legitimate, update the baseline with:`)
+  console.error(`  node scripts/check-structural.js --fix-baseline`)
+  process.exit(1)
+} else {
+  console.log('\nStructural gate PASSED')
+}
diff --git a/scripts/ci-verify.sh b/scripts/ci-verify.sh
new file mode 100755
index 0000000..343ad18
--- /dev/null
+++ b/scripts/ci-verify.sh
@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$ROOT"
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+pass_count=0
+fail_count=0
+start_time=$(date +%s)
+
+step() {
+  local label="$1"
+  shift
+  echo -e "${YELLOW}[CI]${NC} ${label}..."
+  if "$@" > /tmp/ci-output-$$.log 2>&1; then
+    echo -e "  ${GREEN}PASS${NC}"
+    pass_count=$((pass_count + 1))
+  else
+    echo -e "  ${RED}FAIL${NC}"
+    tail -30 /tmp/ci-output-$$.log
+    fail_count=$((fail_count + 1))
+  fi
+}
+
+echo "============================================================"
+echo " Imhotep CI Verification"
+echo "============================================================"
+echo ""
+
+# 1. Build all packages
+step "Build" npm run build
+
+# 2. Typecheck
+step "Typecheck" npm run typecheck
+
+# 3. Lint
+step "Lint" npm run lint
+
+# 4. Structural conformance (as any, empty catch, ?? 0 baselines)
+step "Structural conformance" node scripts/check-structural.js
+
+# 5. Unit tests (DSL, core, solver, playwright)
+step "Core tests (DSL)" npm test --workspace=imhotep-dsl --if-present
+step "Core tests (core)" npm test --workspace=imhotep-core --if-present
+step "Core tests (solver)" npm test --workspace=imhotep-solver --if-present
+step "Core tests (extractor)" npm test --workspace=imhotep-extractor --if-present
+step "Core tests (geometry)" npm test --workspace=imhotep-geometry --if-present
+
+# 6. E2E tests (requires browser)
+echo -e "${YELLOW}[CI]${NC} E2E hard tests..."
+if npx playwright test --config packages/imhotep-fixtures/playwright.config.ts --grep="hard test" --workers=1 > /tmp/ci-output-$$.log 2>&1; then
+  echo -e "  ${GREEN}PASS${NC}"
+  pass_count=$((pass_count + 1))
+else
+  echo -e "  ${RED}FAIL${NC}"
+  tail -30 /tmp/ci-output-$$.log
+  fail_count=$((fail_count + 1))
+fi
+
+# Summary
+end_time=$(date +%s)
+elapsed=$((end_time - start_time))
+
+echo ""
+echo "============================================================"
+echo " CI Summary"
+echo "============================================================"
+echo "  Passed: ${GREEN}${pass_count}${NC}"
+echo "  Failed: ${RED}${fail_count}${NC}"
+echo "  Elapsed: ${elapsed}s"
+echo ""
+
+if [ "$fail_count" -gt 0 ]; then
+  echo -e "${RED}CI verification FAILED${NC}"
+  exit 1
+else
+  echo -e "${GREEN}CI verification PASSED${NC}"
+  exit 0
+fi