AUTO-GRADING SYSTEM COMPREHENSIVE AUDIT REPORT

Date: May 8, 2026
Scope: Full architecture audit covering Engine, Workers, UI, WASM, PNG handling, and compilation pipeline

1. CRITICAL INITIALIZATION COMPATIBILITY ISSUES

1.1 Two Competing Worker Implementations - COLLISION RISK [WARN]

Location: GradingPage.jsx line 3

javascript

import GradingWorker from '../worker/grading-engine.worker.ts?worker';

Problem:

File conflict: grading-worker.ts (v3.9) vs grading-engine.worker.ts (v3.9) both exist
GradingPage only imports v3.9 (dynamic loader), never uses v3.9 (direct WASM)
v3.9 is orphaned: No UI is calling it, but it's maintained and has different error handling
Import statement inconsistency: v3.9 uses dynamic imports; v3.9 uses static imports
Message handler incompatibility: Slightly different log message formats

Impact:

If developers accidentally call v3.9 worker, it will fail silently with missing emulator exports
Maintenance nightmare: Two implementations doing similar work but diverging

What happens if both workers initialize:

v3.9 tries direct imports: import { FullCircuitValidator } from "@openhw/emulator/..."
v3.9 tries dynamic imports: emulatorExports = await import("@openhw/emulator")
Both compete for WASM initialization, one will crash with "emulatorExports is undefined"

1.2 WASM Initialization Race Condition - Engine Crash 🔴

Location: Both workers (grading-worker.ts line 35, grading-engine.worker.ts line 45)

Problem:

typescript

let isInitialized = false;

async function initEngine() {
    if (isInitialized) return;  // ← RACE CONDITION HERE
    console.log("Initializing WASM Engine...");
    await init(wasmUrl);
    init_panic_hook();
    isInitialized = true;
}

Issue:

If two messages arrive before isInitialized is set to true, both will call await init(wasmUrl)
This causes double initialization, leading to:
- Memory leaks (WASM module loaded twice)
- Conflicting panic hooks
- Undefined behavior in WASM bindings

v3.9 Dynamic Loader Issue:

typescript

async function initEngine() {
    if (isInitialized) return;  // ← SAME PROBLEM
    wasmExports = await import('../wasm/grading/...');  // First caller sets this
    const wasmUrl = wasmUrlMod.default;
    await wasmExports.default(wasmUrl);
    if (wasmExports.init_panic_hook) wasmExports.init_panic_hook();  // Can fire twice
    isInitialized = true;
}

Fix Needed: Use a Promise to serialize initialization

typescript

let initPromise: Promise<void> | null = null;

async function initEngine() {
    if (initPromise) return initPromise;
    initPromise = (async () => {
        // ... actual init code
    })();
    return initPromise;
}

1.3 Emulator Exports Not Guaranteed at Message Time - v3.9 WASM Reference Crash

Location: grading-engine.worker.ts line 320+

Problem:

typescript

onmessage = async (e: MessageEvent<GradingMessage>) => {
    await initEngine();  // ← initEngine only initializes WASM, not emulatorExports in all cases
    
    // ...
    const validator = new emulatorExports.FullCircuitValidator(studentMeta);
    //     ^^^^^^^^^^^^^^^^ CRASH: emulatorExports might still be undefined!

Why it crashes:

initEngine() in v3.9 does: emulatorExports = await import("@openhw/emulator");
But if import() fails silently or returns empty object, emulatorExports is still falsy
Later code tries to use emulatorExports.FullCircuitValidator → TypeError

v3.9 Comparison (More Robust):

typescript

// Direct imports at top level catch errors immediately:
import { FullCircuitValidator } from "@openhw/emulator/src/circuit-validation/engine.js";

Fix Needed:

v3.9 should throw if emulatorExports is missing
v3.9 should be the primary implementation
Remove v3.9 or properly validate initialization

1.4 Polyfill Side-Effects Breaking Worker Context - v3.9

Location: grading-engine.worker.ts lines 1-10

Problem:

typescript

if (typeof window === 'undefined') {
    (self as any).window = self;  // ← Creates artificial window object
    (self as any).document = {
        createElement: () => ({ style: {} }),
        // ... incomplete mock
    };
}
(self as any).$RefreshReg$ = () => {};  // ← React refresh mocks
(self as any).$RefreshSig$ = () => () => (type: any) => type;

Issues:

Mocking window in a Worker context can confuse libraries that check for typeof window
Some libraries specifically check typeof window === 'undefined' to detect Workers
Incomplete document mock might break dynamic feature detection
React refresh mocks are unnecessary in a Worker context

Risk:

If a library detects window exists, it might try DOM operations → crash
@xenova/transformers (used in AI worker) might have different behavior with fake window

2. PNG IMPORT/EXPORT COMPATIBILITY ISSUES

2.1 PNG Metadata Marker Inconsistency - Import/Export Mismatch

Location:

Export: SimulatorPage.jsx line 7853 const MARKER = '\x00OPENHW_META\x00';
Import: SimulatorPage.jsx line 8678 const marker = '\x00OPENHW_META\x00';

Good News: Markers match [YES]

But Issue: Metadata appending happens AFTER PNG encode:

javascript

// export
out.toBlob(async (blob) => {
    const pngBuf = await blob.arrayBuffer();
    const pngBytes = new Uint8Array(pngBuf);
    const metaBytes = new TextEncoder().encode(jsonPayload);
    const combined = new Uint8Array(pngBytes.length + metaBytes.length);
    combined.set(pngBytes);
    combined.set(metaBytes, pngBytes.length);

Problem: If PNG is > 2GB (unlikely but worth noting), or contains binary data that looks like UTF-8 text:

Import searches from END backwards: for (let i = bytes.length - markerBytes.length; i >= 0; i--)
This is actually correct and safe [YES]

However: UTF-8 Decoding Issue:

javascript

const jsonStr = new TextDecoder('utf-8', { fatal: false }).decode(payloadBytes);

Using fatal: false means invalid UTF-8 is silently replaced with replacement character
Then JSON.parse(jsonStr) silently fails or returns garbage
No error handling after decode!

Fix Needed:

javascript

try {
    const jsonStr = new TextDecoder('utf-8', { fatal: true }).decode(payloadBytes);
    const meta = JSON.parse(jsonStr);
} catch (err) {
    alert('PNG metadata is corrupted or invalid UTF-8. ' + err.message);
    return;
}

2.2 PNG Export Cache Not Transferred Between Sessions

Location: SimulatorPage.jsx line 7760

javascript

const _exportPngResultCache = new Map();  // ← Session-only cache

// ...

if (cached && (Date.now() - cached.createdAt) < CACHE_TTL) {
    // Returns cached PNG
}

Problem:

Cache is per-session, lost on page refresh
WASM PNG export might be slower than expected because cache resets
No localStorage fallback for large exports

Not a blocker, but inefficiency

2.3 SVG Sanitization for WASM Export Missing Edge Case

Location: SimulatorPage.jsx line 8085

Code:

javascript

assets[type] = svg.outerHTML
    .replace(/&nbsp;/g, '&#160;')
    .replace(/<br\s*\/?>/gi, ' ');

Problem:

Only handles   and <br> tags
USVG (Rust XML parser) is strict and might reject:
- HTML entities like ©, ® (only XML standard entities allowed: <, >, &, ", ')
- SVG with namespaced attributes like xlink:href if not properly declared
- Comments or processing instructions

Fix: More comprehensive SVG sanitization needed before WASM

3. PROJECT COMPILATION PIPELINE ISSUES

3.1 projectCompilerUtils.js - Board Discovery Fragility

Location: projectCompilerUtils.js lines 40-50

javascript

export function getBoardCompileFiles(project, boardId) {
    const projectFiles = normalizeProjectFiles(project.projectFiles);
    
    let targetBoardId = boardId;
    
    // Safety fallback for board discovery
    const hasFilesForBoard = projectFiles.some(f => f.path.startsWith(`project/${targetBoardId}/`));
    if (!hasFilesForBoard) {
        const firstBoardFile = projectFiles.find(f => f.path.startsWith('project/'));
        if (firstBoardFile) {
            const match = firstBoardFile.path.match(/^project\/([^/]+)\//);
            if (match) targetBoardId = match[1];  // ← Silently changes boardId!
        }
    }

Problems:

Silent fallback: If requested board doesn't exist, silently uses first board found
- No warning logged to worker
- Student submission for "arduino:uno" gets compiled as "rp2040:pico" without notification
Inconsistent with grading: Teacher graded on "uno" but student compiled on "pico"
No error propagation: Worker doesn't know compilation unit changed

Impact in Grading:

typescript

// In worker:
const boardCompId = boardComp?.id || 'uno1';  // Assumes 'uno1'
const compileUnit = getBoardCompileFiles(meta, boardCompId);
// If projectCompilerUtils silently uses 'pico1', comparison is between different circuits!

Fix: Throw error or explicitly warn when board changes

javascript

if (!hasFilesForBoard && firstBoardFile) {
    const msg = `Requested board '${boardId}' not found. Using '${newId}' instead.`;
    console.warn(msg);
    // Return { warning: msg, mainCode: "", ... } or throw
}

3.2 Main File Detection Order Can Pick Wrong File

Location: projectCompilerUtils.js lines 53-61

javascript

const preferredMainName = `${targetBoardId}.ino`;
const main = boardFiles.find((f) => f.name === preferredMainName || f.path.endsWith(preferredMainName))
          || boardFiles.find((f) => fileExt(f.name) === '.ino')
          || boardFiles[0]  // ← Picks ANY first file if no .ino found
          || null;

Problem:

If project has files: [board.h, board.cpp] (no .ino), picks .h as main
Arduino compiler expects .ino as entry point
Compilation fails with misleading error about .h syntax

Risk: Silent compilation failure if no .ino file exists

3.3 Disabled Files Not Filtered in Compilation Payload

Location: projectCompilerUtils.js line 68

javascript

const files = boardFiles
    .filter((f) => !(main && f.path === main.path))
    .map((f) => ({ name: f.name, content: f.content || '' }));

Problem:

Files ARE filtered to exclude main file
But the isFileDisabled() check is done on boardFiles (line 39)
If a file was re-enabled AFTER import, the disabled flag is stale
Compiler might include .disabled files in the compilation payload

4. WORKER MESSAGE PROTOCOL INCOMPATIBILITIES

4.1 v3.9 vs v3.9 Response Format Drift

v3.9 Final Response:

typescript

postMessage({ 
    type: 'GRADING_COMPLETE', 
    result,
    teacherBinaryKey: teacherBinaryKey 
});

v3.9 Final Response:

typescript

(self as any).postMessage({ type: 'REPORT', report: finalResult });
postMessage({ 
    type: 'GRADING_COMPLETE', 
    result,
    teacherBinaryKey: teacherBinaryKey 
});

Issues:

v3.9 sends TWO different message types (REPORT and GRADING_COMPLETE)
GradingPage.jsx only listens for GRADING_COMPLETE (line 44)
REPORT message is lost/ignored

v3.9 sends extra data in finalResult that v3.9 doesn't:

typescript

teacher_key: teacherBinaryKey,
teacher_telemetry: teacher instanceof ArrayBuffer ? ... : null,
student_telemetry: JSON.stringify(studentTelemetry),
ai_status: "Skipped (Simulation Match Mode)",
ai_score: 0

GradingPage.jsx expects:

javascript

if (e.data.type === 'GRADING_COMPLETE') {
    if (e.data.result.logs) {  // ← v3.9 has result.logs?
        e.data.result.logs.forEach(log => addLog(log, 'info'));
    }
    // ...
    const finalReport = e.data.result;

Compatibility Failure: v3.9 result structure doesn't have .logs array

4.2 LOG Message Format Inconsistency

v3.9 Logs:

typescript

postMessage({ type: 'LOG', msg: `[v2.4] ${label} simulation timed out!` });

v3.9 Logs:

typescript

postMessage({ type: 'LOG', msg: `[TRACE] ${label}: Starting capture behavior...` });

Problem:

Log parsing in GradingPage might expect specific format
Timestamps inconsistent
Severity levels different (no logType in some places)

4.3 KEY_GENERATED Message Not Handled Identically

v3.9:

typescript

postMessage({ type: 'KEY_GENERATED', key });

v3.9:

typescript

postMessage({ type: 'KEY_GENERATED', key });

Same format, but v3.9 might send additional data in future updates while v3.9 doesn't.

5. WASM MODULE INITIALIZATION SEQUENCING

5.1 Panic Hook Setup Order Issue

Location: Both workers after WASM init

typescript

await init(wasmUrl);
init_panic_hook();  // ← Must be called AFTER init() completes

Problem:

If init() fails silently, init_panic_hook() still executes
Panic hook might not be attached to the WASM module if init failed
Later panic crashes the worker with no diagnostic info

5.2 Extract Project Meta Called Before WASM Guarantee

Location: grading-worker.ts line 235 (right after initEngine)

typescript

await initEngine();

if (type === 'GENERATE_KEY') {
    // ...
    projectJson = extract_project_meta(new Uint8Array(buf as any));
    //            ^^^^^^^^^^^^^^^^^^^^^^ What if initEngine failed silently?

Problem:

initEngine() doesn't throw on failure in either version
If WASM wasn't loaded, extract_project_meta function doesn't exist
Calls undefined() → TypeError

6. CROSS-WORKER DEPENDENCY ISSUES

6.1 AI-Audit Worker Spawned Without Guarantee of Results

Location: GradingPage.jsx line 52-83

javascript

const aiWorker = new Worker(new URL('../worker/ai-audit-final.worker.ts', import.meta.url), { type: 'module' });

aiWorker.onmessage = (aiEvent) => {
    const aiData = aiEvent.data;
    if (aiData.type === 'STATUS') { ... }
    else if (aiData.type === 'RESULT') { ... }
};

aiWorker.postMessage({
    type: 'GRADE_SEMANTICS',
    teacherTelemetry: finalReport.teacher_telemetry,
    studentTelemetry: finalReport.student_telemetry,
    idMapping: finalReport.id_mapping
});

Issues:

No timeout for AI worker
If AI model fails to load, no recovery
AI worker references idMapping that might not exist in v3.9 response

6.2 Emulator Exports Used But Not Validated

Location: grading-engine.worker.ts line 313+

typescript

// After dynamic import:
const validator = new emulatorExports.FullCircuitValidator(studentMeta);

Problem:

emulatorExports could be { FullCircuitValidator: undefined }
No null check before usage
Crashes with "Cannot create an instance of undefined"

7. TELEPORTABLE OBJECTS & WASM BOUNDARY ISSUES

7.1 Binary Key Type Confusion

GradingPage.jsx line 303:

javascript

let teacherData;
if (teacherKeyCacheRef.current.hash === fileHash && teacherKeyCacheRef.current.key) {
    teacherData = teacherKeyCacheRef.current.key;  // ← What type is this?
} else {
    teacherData = await teacherFile.arrayBuffer();  // ← ArrayBuffer
}

Problem:

First time: teacherData is ArrayBuffer
After caching: teacherData is Uint8Array (from generate_binary_key() return)
Worker expects consistent type for GENERATE_KEY vs GRADE

In Worker:

typescript

if (teacher instanceof ArrayBuffer) {  // ← This check assumes ArrayBuffer
    const teacherMetaJson = wasmExports.extract_project_meta(new Uint8Array(teacher));
} else {
    teacherBinaryKey = new Uint8Array(teacher as any);  // ← Falls back to Uint8Array
}

Issue: Logic works but is fragile. If cache stores wrong type, extraction fails silently.

7.2 Transferable Objects Transfer Rules Violated

GradingPage.jsx line 310:

javascript

const transferables = [];
if (teacherData instanceof ArrayBuffer) transferables.push(teacherData);
else if (teacherData && teacherData.buffer instanceof ArrayBuffer) transferables.push(teacherData.buffer);

if (studentBuf instanceof ArrayBuffer) transferables.push(studentBuf);

workerRef.current.postMessage({
    type: 'GRADE',
    teacher: teacherData,
    student: studentBuf,
    options
}, transferables);

Problem:

If teacherData is Uint8Array, the buffer is transferred but the Uint8Array reference in UI becomes detached
Subsequent cache operations on detached Uint8Array might fail
Should deep-clone instead of transferring for cache data

8. ERROR RECOVERY & CRASH HANDLING

8.1 No Recovery Path for Partial WASM Load Failure

Location: Both workers initEngine()

Scenario:

WASM blob fails to download (network error)
init(wasmUrl) silently fails or throws
No try-catch around init() call
Worker crashes

typescript

async function initEngine() {
    if (isInitialized) return;
    await init(wasmUrl);  // ← No error handling
    init_panic_hook();
    isInitialized = true;
}

8.2 Silent Failure in captureBehavior Function

Location: Both workers lines 131+

typescript

catch (err) {
    postMessage({ type: 'LOG', msg: `[v2.3] Warning: ${label} simulation failed: ${err}`, logType: 'warning' });
    return telemetry;  // ← Returns EMPTY telemetry!
}

Problem:

If simulation crashes, telemetry is { events: [], serial: "", duration_ms: ... }
Grading proceeds with empty telemetry → all scores become 0
UI shows "0% behavioral match" but doesn't know simulation crashed
No way to distinguish "perfect code" from "compilation error"

9. PROJECTCOMPILERUTILS PAYLOAD STRUCTURE ISSUES

9.1 Source Code Detection Fragile

Location: grading-worker.ts lines 120-125

typescript

const sourceCode = compileUnit.mainCode || "";
const isSourceCode = sourceCode.startsWith('#') || 
                     sourceCode.includes('void setup') || 
                     sourceCode.includes('void loop') ||
                     sourceCode.includes('int main');

Problems:

Comments starting with # are not C/C++ directives (should be only #include, #define, etc.)
String literals containing "void setup" trigger false positive: const msg = "void setup() {...}"
No check for Arduino .ino syntax (which is C++)

Better detection:

typescript

const hasArduinoMarkers = /\b(void\s+setup|void\s+loop|pinMode|digitalWrite|Serial\.begin)\s*\(/.test(sourceCode);
const hasInclude = sourceCode.includes('#include');

9.2 File Extension Check Case Sensitivity

Location: projectCompilerUtils.js line 38

javascript

const allowed = new Set(['.ino', '.h', '.hpp', '.c', '.cpp']);
// ...
.filter((f) => allowed.has(fileExt(f.path)));

export function fileExt(path) {
    const idx = String(path || '').lastIndexOf('.');
    return idx >= 0 ? path.substring(idx).toLowerCase() : '';  // ← Converts to lowercase
}

This is good - case insensitive [YES]

But issue: What if Windows file system has .INO (uppercase)?

fileExt() converts to .ino [YES]
File is included [YES]
Arduino compiler might have issues with uppercase extensions on Linux [WARN]

10. AI SEMANTIC WORKER INITIALIZATION

10.1 Transformers Library Might Fail to Load

Location: ai-audit-final.worker.ts line 30+

typescript

async function initTransformers() {
    if (pipeline) return;
    
    const transformers = await import('@xenova/transformers');
    pipeline = transformers.pipeline;
    env = transformers.env;

Problems:

If @xenova/transformers is not bundled, import fails
No error message guides user to install it
AI worker silently dies

10.2 WASM Model Path Configuration

Location: ai-audit-final.worker.ts line 41

typescript

env.backends.onnx.wasm.wasmPaths = '/';  // ← Assumes WASM files at root
env.localModelPath = '/models/';         // ← Assumes models in public/models/

Problem:

If app is served from subpath (e.g., /app/grading), paths are wrong
WASM files and models will 404
No fallback URL resolution

11. SUMMARY TABLE OF CRITICAL vs HIGH ISSUES

Issue	Severity	Component	Impact
Two competing workers	CRITICAL	Architecture	Engine crash if wrong worker selected
WASM init race condition	CRITICAL	Workers	Double initialization, undefined behavior
Missing emulatorExports	CRITICAL	v3.9 worker	TypeError when grading
PNG metadata decode no error handling	HIGH	SimulatorPage	Silent data loss
Silent board discovery fallback	HIGH	projectCompilerUtils	Teacher vs student mismatch
No recovery for WASM load failure	HIGH	Workers	Worker crash on network error
Empty telemetry on simulation crash	HIGH	Workers	Misleading scores (0% for both success and crash)
Key type confusion (ArrayBuffer vs Uint8Array)	MEDIUM	GradingPage	Fragile caching, potential crashes
Panic hook not guaranteed	MEDIUM	Workers	Silent crashes in WASM
AI worker no timeout	MEDIUM	GradingPage	UI hangs if AI model fails

12. RECOMMENDED FIXES (Priority Order)

IMMEDIATE (Before Next Production Deployment)

Remove v3.9 or make v3.9 compatible
- Delete grading-worker.ts OR
- Make both identical implementations
Fix WASM initialization race
- Use Promise serialization
- Add explicit error handling
Fix emulatorExports undefined
- Add null checks before usage
- Throw clear error if missing
Add PNG metadata decode error handling
- Try-catch around JSON.parse
- Log corruption errors

SHORT TERM (Next Sprint)

Fix silent board discovery
Improve source code detection
Add recovery for WASM load failures
Distinguish simulation crash from success in telemetry

MEDIUM TERM

Refactor to single worker implementation
Add comprehensive error recovery in all workers
Improve AI worker timeout and fallbacks

13. EXPECTED FAILURE SCENARIOS

These scenarios WILL crash the engine:

User runs grading twice in quick succession
- Race condition in WASM init causes double initialization
- Panic hooks conflict
- Worker dies
PNG with UTF-8 metadata encoding issues
- Invalid characters in project data
- Silent JSON parse failure
- Wrong circuit loaded
Project missing .ino file
- getBoardCompileFiles picks .h as main
- Compiler rejects .h syntax
- Confusing error message
Network latency during WASM load
- await init(wasmUrl) times out
- No error propagation
- Worker hangs silently
Teacher uploaded for board "uno", student uploaded for board "pico"
- Silent board discovery fallback
- Both compiled as different boards
- Comparison fails with 0% match
- No warning that boards don't match

FILE LOCATIONS REFERENCE

openhw-studio-grading-engine/
├── src/lib.rs                               # Rust grading logic
├── Cargo.toml                               # WASM build config
└── pkg/                                     # Compiled WASM outputs
    ├── openhw_studio_grading_engine.js      # WASM bindings
    └── openhw_studio_grading_engine_bg.wasm # Binary WASM

OpenHW-studio-frontend/
├── src/worker/
│   ├── grading-worker.ts                    # v3.9 (Primary)
│   ├── grading-engine.worker.ts             # v3.9 (Dynamic - PROBLEM)
│   └── ai-audit-final.worker.ts             # AI semantic worker
├── src/wasm/
│   ├── grading/openhw_studio_grading_engine.js
│   └── grading/openhw_studio_grading_engine_bg.wasm
├── src/pages/
│   ├── GradingPage.jsx                      # Main UI coordinator
│   └── simulationpage/
│       ├── SimulatorPage.jsx                # PNG import/export logic
│       └── utils/projectCompilerUtils.js    # Compilation pipeline
└── src/utils/projectCompilerUtils.js        # Source of truth for files

CONCLUSION

The auto-grading system has multiple critical compatibility issues that can cause silent failures or crashes:

Architecture level: Two worker implementations competing
Initialization level: Race conditions in WASM setup
Data pipeline level: Silent fallbacks and missing error handling
Protocol level: Message format drift between implementations

Recommend immediate action on Critical items before any student-facing use.

AUTO-GRADING SYSTEM COMPREHENSIVE AUDIT REPORT ​

1. CRITICAL INITIALIZATION COMPATIBILITY ISSUES ​

1.1 Two Competing Worker Implementations - COLLISION RISK [WARN] ​

1.2 WASM Initialization Race Condition - Engine Crash 🔴 ​

1.3 Emulator Exports Not Guaranteed at Message Time - v3.9 WASM Reference Crash ​

1.4 Polyfill Side-Effects Breaking Worker Context - v3.9 ​

2. PNG IMPORT/EXPORT COMPATIBILITY ISSUES ​

2.1 PNG Metadata Marker Inconsistency - Import/Export Mismatch ​

2.2 PNG Export Cache Not Transferred Between Sessions ​

2.3 SVG Sanitization for WASM Export Missing Edge Case ​

3. PROJECT COMPILATION PIPELINE ISSUES ​

3.1 projectCompilerUtils.js - Board Discovery Fragility ​

3.2 Main File Detection Order Can Pick Wrong File ​

3.3 Disabled Files Not Filtered in Compilation Payload ​

4. WORKER MESSAGE PROTOCOL INCOMPATIBILITIES ​

4.1 v3.9 vs v3.9 Response Format Drift ​

4.2 LOG Message Format Inconsistency ​

4.3 KEY_GENERATED Message Not Handled Identically ​

5. WASM MODULE INITIALIZATION SEQUENCING ​

5.1 Panic Hook Setup Order Issue ​

5.2 Extract Project Meta Called Before WASM Guarantee ​

6. CROSS-WORKER DEPENDENCY ISSUES ​

6.1 AI-Audit Worker Spawned Without Guarantee of Results ​

6.2 Emulator Exports Used But Not Validated ​

7. TELEPORTABLE OBJECTS & WASM BOUNDARY ISSUES ​

7.1 Binary Key Type Confusion ​

7.2 Transferable Objects Transfer Rules Violated ​

8. ERROR RECOVERY & CRASH HANDLING ​

8.1 No Recovery Path for Partial WASM Load Failure ​

8.2 Silent Failure in captureBehavior Function ​

9. PROJECTCOMPILERUTILS PAYLOAD STRUCTURE ISSUES ​

9.1 Source Code Detection Fragile ​

9.2 File Extension Check Case Sensitivity ​

10. AI SEMANTIC WORKER INITIALIZATION ​

10.1 Transformers Library Might Fail to Load ​

10.2 WASM Model Path Configuration ​

11. SUMMARY TABLE OF CRITICAL vs HIGH ISSUES ​

12. RECOMMENDED FIXES (Priority Order) ​

IMMEDIATE (Before Next Production Deployment) ​

SHORT TERM (Next Sprint) ​

MEDIUM TERM ​

13. EXPECTED FAILURE SCENARIOS ​

FILE LOCATIONS REFERENCE ​

CONCLUSION ​

AUTO-GRADING SYSTEM COMPREHENSIVE AUDIT REPORT

1. CRITICAL INITIALIZATION COMPATIBILITY ISSUES

1.1 Two Competing Worker Implementations - COLLISION RISK [WARN]

1.2 WASM Initialization Race Condition - Engine Crash 🔴

1.3 Emulator Exports Not Guaranteed at Message Time - v3.9 WASM Reference Crash

1.4 Polyfill Side-Effects Breaking Worker Context - v3.9

2. PNG IMPORT/EXPORT COMPATIBILITY ISSUES

2.1 PNG Metadata Marker Inconsistency - Import/Export Mismatch

2.2 PNG Export Cache Not Transferred Between Sessions

2.3 SVG Sanitization for WASM Export Missing Edge Case

3. PROJECT COMPILATION PIPELINE ISSUES

3.1 projectCompilerUtils.js - Board Discovery Fragility

3.2 Main File Detection Order Can Pick Wrong File

3.3 Disabled Files Not Filtered in Compilation Payload

4. WORKER MESSAGE PROTOCOL INCOMPATIBILITIES

4.1 v3.9 vs v3.9 Response Format Drift

4.2 LOG Message Format Inconsistency

4.3 KEY_GENERATED Message Not Handled Identically

5. WASM MODULE INITIALIZATION SEQUENCING

5.1 Panic Hook Setup Order Issue

5.2 Extract Project Meta Called Before WASM Guarantee

6. CROSS-WORKER DEPENDENCY ISSUES

6.1 AI-Audit Worker Spawned Without Guarantee of Results

6.2 Emulator Exports Used But Not Validated

7. TELEPORTABLE OBJECTS & WASM BOUNDARY ISSUES

7.1 Binary Key Type Confusion

7.2 Transferable Objects Transfer Rules Violated

8. ERROR RECOVERY & CRASH HANDLING

8.1 No Recovery Path for Partial WASM Load Failure

8.2 Silent Failure in captureBehavior Function

9. PROJECTCOMPILERUTILS PAYLOAD STRUCTURE ISSUES

9.1 Source Code Detection Fragile

9.2 File Extension Check Case Sensitivity

10. AI SEMANTIC WORKER INITIALIZATION

10.1 Transformers Library Might Fail to Load

10.2 WASM Model Path Configuration

11. SUMMARY TABLE OF CRITICAL vs HIGH ISSUES

12. RECOMMENDED FIXES (Priority Order)

IMMEDIATE (Before Next Production Deployment)

SHORT TERM (Next Sprint)

MEDIUM TERM

13. EXPECTED FAILURE SCENARIOS

FILE LOCATIONS REFERENCE

CONCLUSION