test(bench): execute live SNB BI2 through the public API

[DecisionNerd]

The SNB BI suite previously validated replayed results without proving public GraphForge execution. Add a bounded BI2 fixture that loads through the real Rust facade and executes the pinned query with public parameter binding. Validate its Arrow result against an independent seed-derived reference and keep load/query/resource evidence separate from correctness.

BI2 is the live execution proof. The remaining mapped BI reads retain explicitly labeled static/reference replay coverage; this change does not claim the entire SNB BI workload is live or benchmark-certified. The synthetic seed and repository driver use content hashes rather than invented upstream commit identities, with strict acquisition/schema matching and source-drift tests. Large factors remain opt-in external work.

Reject nulls in every required BI2 result column before reading Arrow payloads. The regression preserves reference-matching payload bytes beneath null bits, proving they cannot falsely pass validation.

Validation on the integrated tree:

• make -C benchmarks smoke: passed, including 378 Python tests, all Rust runner tests (18 SNB BI tests), benchmark workspace Clippy, formatting, and the real Cargo dependency check.
• Real CLI/facade execution, independent reference validation, null rejection, source identity, and negative provenance/parameter cases passed.
• make pre-push-fast and final diff checks: passed.
• Integration retained current dependency versions; the lockfile only adds SNB BI’s declared Arrow, facade, and SHA-2 edges.

Closes #963. #952 remains the broader M11 completion gate. Exact-head CI run 33945956077 passed at 1ee4852a21b04b504f2d8a87c3fea48f0e791c6f; CI Gate passed, the merge state was CLEAN, and no review threads were unresolved. Squash merged as f5fe689b515720b99cfa034678bc2d01b0365160; issue #963 is closed.

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