feat: implement OGLO TAG2 diagnostics and evidence parsing

[sungman-cho]

Objective

Implement the complete oglo-python portion of the intermittent USB disconnect causal-evidence plan in one repository-scoped PR.

Delivery checklist

• Freeze the canonical TAG1, TAG2, and CONTEXT wire contract
• Publish deterministic cross-language vectors and manifest hashes
• Reject competing incompatible TAG2 contract projections
• Implement TAG2 negotiation, admission, canonical parsing, and tail preservation
• Implement record and replay support
• Pass old/new host and firmware compatibility tests
• Pass physical throughput and jitter gates

Current commits

• 7248cdf feat: freeze OGLO diagnostics wire contract
• 7d35146 test: reject competing TAG2 contracts

Current verification

• python3 tools/generate_diagnostics_contract.py --check
• PYTHONPATH=. uv run --python 3.13 pytest -q
• 442 passed, 10 deselected
• all 7 GitHub CI jobs passed

Integration constraint

Draft PR #5 currently implements a different TAG2 header, ASCII ACK, sequence scope, and admission model. Its implementation must be rewritten against the canonical contract in this PR; it must not merge as-is.

Known limitations

The current vectors are deterministic synthetic conformance vectors. Firmware implementation and physical captures remain pending.

[sungman-cho]

범위를 기존 제품/와이어 스키마를 변경하지 않는 log-only 계측으로 좁혔습니다. 이 PR의 TAG2/진단 wire contract 변경은 모두 되돌렸고 main 대비 diff가 없으므로 닫습니다. 별도 firmware/stream schema 변경은 진행하지 않습니다.