PoC 13D — Six-Vector NPU Numerical Qualification

Question

Does the sealed Wave NBG return the correct quantized Erf values for boundary, structured, random, and real learned inputs?

Fixed vectors

1. zero point (128);
2. minimum (0);
3. maximum (255);
4. repeated 0..255 ramp;
5. xorshift32 seed 0x57335645;
6. learned fixture frame 341.

The pack is 2,902 bytes, SHA-256 3374b928722c7d504e9ae8d8e1e99c1dc7b3542ee08cbede60b2f8bb8f93a232, FNV-1a64 0x8f90178b58ca8afb.

Safety envelope

• one context and graph;
• one NBG node;
• one compile;
• six sequential runs;
• fixed input pack and NBG paths;
• 32-byte prefix/suffix output canaries;
• 20-second native watchdog and 30-second host deadline;
• no retry, recovery, output file, arbitrary argument, CLC, or direct ioctl.

Result

status: PASS
execution attempts: 1
vectors: 6 / 6
compared bytes: 2,886
mismatched bytes: 0
maximum U8 error: 0
learned output unique values: 63
canaries: PASS
health differences: none
kernel alerts: none

Latency:

per vector: 1,571, 167, 164, 132, 116, 116 us
warm range: 116..167 us

Evidence

Artifact	SHA-256
Runner binary	99d51397b8c6b21c360755b6a66cc62eba3897287fb12a215468bd8f7e2f62d3
Execution manifest	10565c58589afdf7e9514220863fd03a7d52b20235ea38be669b4f773d5f873c
Run result	f8ffbca89fb96275e1c404ea780c1ccb62de3deda07820ec7308ccf6aaab7fac

Oracle

The host independently creates a 256-entry table with:

clamp(round(erf((u8 - 128) / 32) * 128) + 128, 0, 255)

The table SHA-256 is c9525963e022d4a4aea0814845119b37488f3727ec8d96684f52e1e2ad776296. The native runner does not contain that output table and cannot declare numerical success by comparing against its own oracle.

Interpretation

This proves exact numerical NPU execution for the sealed partition. It does not yet prove a full enhanced waveform.

Next gate

Run every partition frame from the frozen audio fixture, pull the ordered output pack, and reconstruct audio from those NPU bytes.