docs: add Unsloth GGUF validation case study - #5

Summary

• add OMIV Case Study 01 for an Unsloth Gemma 4 E2B IT Q8_0 GGUF export
• record the successful export and retained historical artifact-identity match
• add machine-readable results, claims, evidence definitions, methodology, and limitations
• document provenance-observability and main/mmproj association boundaries without attributing them to a specific component

Context

This case began with a public technical exchange with Daniel Han. We are grateful to Daniel for suggesting Gemma 4 E2B IT and for giving OMIV the opportunity to test a real Unsloth export path.

This does not claim a formal partnership, certification, endorsement, or Unsloth approval of the results.

Important boundaries

• historical C1 bytes were unavailable
• no new direct C1/C2 byte comparison was performed
• semantic and numerical fidelity were not evaluated
• runtime compatibility was not evaluated
• no model weights or private evidence are included

Validation

• 1,888 tests passed; 9 expected skips
• case-study SHA256SUMS verified
• all 21 claims and 11 evidence IDs resolved
• git diff --check passed
• both retained GGUF hashes remained unchanged