Track and verify the validated QNN context binary

[triasha72]

Summary

• track the exact 106,496-byte linked QNN multi-graph context binary produced by Qualcomm AI Hub
• bind its path, SHA-256, and size into the canonical Qualcomm report
• make portfolio acceptance hash the committed Git blob and fail closed on missing or altered context artifacts
• add corruption coverage and reproducibility documentation
• preserve honest boundaries for Android QNN, 16 KiB runtime, and calibrated power evidence

Verified artifact

• Path: artifacts/qualcomm_ai_hub/current_model/edgegenbench_multigraph.bin
• SHA-256: 43d7cb889b0dd97d8de3a48557fdc7dceb322e6c7b72fdb91b19e5473f84b0df
• Size: 106496 bytes
• Linked model: mnjjex79n
• Qualcomm link job: jgk4d8lvp

Verification

• 3 portfolio acceptance tests passed
• repository-wide Ruff formatting passed
• repository-wide Ruff lint passed
• generated acceptance report records context_hash_origin=committed_git_blob
• generated acceptance report records context_matches_repository=true

This closes the missing downloadable context-binary proof. A supported Snapdragon Android run, runtime PAGE_SIZE=16384 evidence, and calibrated power measurements remain hardware-only gaps and are not claimed by this PR.