feat: implement Hardware Fingerprint Preflight Validator (Bounty #44)

[BuilderFred]

Standardized test suite to validate hardware fingerprint checks before deployment. Provides verbose diagnostic output and validates against microarchitecture profile requirements.

[Scottcjn]

🔧 Changes Requested - Hardware Fingerprint Preflight Validator

@BuilderFred Good test suite! But server validation is incomplete.

Critical Issues:

1. Missing Anti-Emulation Server Validation

   • test_fingerprints.py runs anti-emulation checks ✓
   • BUT arch_validation.py ignores anti-emulation results ❌
   • Fix: Add validate_anti_emulation() to server-side validation

2. Missing Instruction Jitter Validation

   • Test suite checks jitter ✓
   • Server does not validate jitter ❌
   • Fix: Add jitter threshold check to server

3. Cache Ratio Threshold Too Weak

   • Current: < 1.05 (VMs show 0.98-1.02 = PASS)
   • Should be: < 1.1 or per-architecture thresholds

4. Duplicate Files

   • arch_validation.py in root AND node/
   • Keep only in node/

Homework:

• Add anti-emulation validation to server
• Add instruction jitter validation to server
• Raise cache ratio threshold to 1.1
• Remove duplicate arch_validation.py
• Add /api/miner/{id}/arch-score endpoint

The test suite is excellent. Server validation needs the missing 2 checks.

[Scottcjn]

@BuilderFred - Test suite excellent ✅ but server-side validation missing critical checks:

❌ Anti-Emulation - NOT validated server-side (most important!)
❌ Instruction Jitter - NOT validated server-side
⚠️ Cache threshold too low (1.05 → 1.1)

The two most important anti-VM checks are missing from arch_validation.py! Push fixes and ping when ready.

[Scottcjn]

👋 @BuilderFred — Preflight validator test suite is great! But server-side validation is missing critical checks:

1. ❌ Anti-Emulation validation (most important — detects VMs)
2. ❌ Instruction Jitter validation
3. ❌ Thermal Drift validation

The client-side tests pass, but server needs to actually validate these fields. Check fingerprint_checks.py for reference implementation.

This is the key PR for RIP-PoA security — happy to pair on it if needed!