docs: audit Rust ownership across dashboard stack

[seonghobae]

Outcome

Records the exact #692/#693/#694 Python-compute audit against ADR 0208 and distinguishes allowed transport/schema/presentation operations from owner mathematical computation. The gap baseline links the actual contextual-orchestrator Rust/PyO3 token-packer follow-up rather than adding local arithmetic.

Evidence

• CodeGraph reviewed before diff inspection
• exact reviewed heads are recorded in the audit
• uv run --extra dev --extra backend pytest -q tests/test_documentation_hygiene.py tests/test_product_gap_baseline.py (the nonexistent second path caused fallback)
• uv run --with pytest pytest -q tests/test_documentation_hygiene.py
• git diff --check

Stacked on #694; no runtime or Dashboard files changed.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Superseded without force-push by #699, rebased on current #694 head 296cbae and corrected to reference open owner PR #865 as candidate evidence only.