CEX: evaluate admitted replay with post-cost walk-forward

[proerror77]

Change contract

Evaluate one admitted Binance CEX snapshot with explicit execution costs, purged and embargoed post-cost walk-forward evidence, and single-candidate sealed holdout access bound to snapshot and protocol identity.

Out of scope

• CEX: search one admitted Binance replay with the shared MCTS kernel #402 shared MCTS adapter and search-kernel changes
• Polymarket research
• Collector, deployment, publication, promotion, runtime, or live execution

Dependency / merge order

• Depends on CEX: admit one immutable Binance replay snapshot into alpha-harness #400 / PR CEX: admit immutable Binance replay snapshots #406, merged as dfb27ef.
• Merge this PR before starting CEX: search one admitted Binance replay with the shared MCTS kernel #402.

Focused validation

• cargo test -p alpha-domain -p alpha-engine -p alpha-store -p alpha-onnx-evaluator -p alpha-harness --quiet
• cargo clippy -p alpha-domain -p alpha-engine -p alpha-store -p alpha-onnx-evaluator -p alpha-harness --all-targets -- -D warnings
• rustfmt --edition 2021 --check on all 15 changed Rust files
• git diff --check
• Standards review: clean
• Spec review against CEX: evaluate an admitted Binance replay with purged post-cost walk-forward #401: clean
• 15 files, 598 changed non-generated lines; below the repository split gate

Rollout / rollback impact

Research evidence only. Evaluator versions advance so prior evidence cannot be admitted under the new accounting and identity semantics. No collector or live path changes. Roll back by reverting this commit.

Closes #401

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 4582f264-7769-4722-839f-a17e3fd7863f

📥 Commits

Reviewing files that changed from the base of the PR and between 74869ec and 45aaa76.

📒 Files selected for processing (15)

• rust_hft/alpha-harness/app/src/cli.rs
• rust_hft/alpha-harness/app/src/governance.rs
• rust_hft/alpha-harness/app/src/loop_control.rs
• rust_hft/alpha-harness/app/src/mission.rs
• rust_hft/alpha-harness/app/src/mission_runner.rs
• rust_hft/alpha-harness/domain/src/lib.rs
• rust_hft/alpha-harness/engine/src/engines/bayesian.rs
• rust_hft/alpha-harness/engine/src/engines/mcts.rs
• rust_hft/alpha-harness/engine/src/engines/mod.rs
• rust_hft/alpha-harness/engine/src/evaluation.rs
• rust_hft/alpha-harness/engine/src/formula_evaluator.rs
• rust_hft/alpha-harness/engine/src/lib.rs
• rust_hft/alpha-harness/engine/src/llm.rs
• rust_hft/alpha-harness/onnx-evaluator/src/lib.rs
• rust_hft/alpha-harness/store/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/cex-post-cost-walk-forward-401

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