feat(jetson): implement fail-closed NNDAL/TensorRT execution contract

[ghost]

Scope

Implements the first executable repository slice of the accepted AEGIS Ω / NVIDIA Jetson contract.

Runtime contract

• Adds aegis_runtime::jetson_execution.
• Separates CUDA IPC and NVMM/dma-buf descriptors.
• Enforces producer/consumer lifetime and CUDA-event coherence ordering.
• Rejects FP8 on Orin SM87 and requires target-local TensorRT engines.
• Requires explicit Q/DQ for INT8 QAT and INT4 weight-only profiles.
• Adds deterministic SGM Hellinger evidence, receipt hashing, replay verification, and strict conjunction admission.
• Encodes 15 ms RAGC and 50 ms end-to-end gates.

Target evidence path

• Adds deploy/jetson/collect_execution_evidence.py.
• Hash-binds model, ONNX, plugin, engine, calibration, SGM certificate, nvpmodel output, RT metrics, latency, thermal and zero-copy evidence.
• Emits ADMITTED only when every gate passes; otherwise emits an explicit denial vector.
• Adds mutation, FP8, deadline, agent-plane and missing-artifact tests.

CI and governance

• Adds a path-scoped Jetson contract workflow for Rust and Python unit gates.
• Adds the exact-parent experiment admission plan bound to main@0bdffe75b56e5cd27c0632e1ba166620da327494.

Honest status

This PR implements and tests the deterministic contract and replayable evidence collector. It does not claim Jetson target-hardware promotion. Production admission still requires a real Orin run producing PREEMPT_RT, zero-copy, TensorRT, RAGC, thermal, SGM and replay receipts.

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