feat(alpha): model explicit execution costs and capacity

[proerror77]

Change contract

Bind explicit taker execution costs and top-N book-capacity assumptions into alpha-harness evaluation protocols and evidence, deduct them consistently across formula and ONNX evaluation, and fail closed when required spread/depth evidence is missing or capacity is exceeded.

Out of scope

• Live execution activation or order routing.
• Collector, market-data ingestion, or production cutover changes.
• Strategy-search behavior beyond applying the bound evaluation contract.
• The K8s change is example-only parameter wiring; it does not deploy or mutate a running workload.

Dependency or merge order

None. This PR is based directly on main and can merge independently.

Focused validation

• cargo fmt --manifest-path rust_hft/Cargo.toml --package alpha-domain --package alpha-engine --package alpha-onnx-evaluator --package alpha-store --package alpha-harness -- --check
• CARGO_BUILD_JOBS=1 cargo test --manifest-path rust_hft/Cargo.toml -p alpha-domain -p alpha-engine -p alpha-onnx-evaluator -p alpha-store -p alpha-harness (214 passed; 1 credential-gated live LLM test ignored)
• CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust_hft/Cargo.toml -p alpha-domain -p alpha-engine -p alpha-onnx-evaluator -p alpha-store -p alpha-harness --all-targets -- -D warnings
• Targeted counterexamples cover missing/negative spread, missing/non-positive depth, capacity breach, protocol/hash tampering, and legacy zero/default compatibility.
• Review scope: 13 files, 589 additions, 11 deletions; below the 25-file / 750-line split threshold.

Rollout / rollback impact

New fields default to zero/false and are omitted from canonical serialization at defaults, preserving legacy protocol hashes and behavior. Research missions opt in through explicit CLI flags; invalid partial capacity configuration is rejected. Roll back by reverting this PR; no data migration or live-execution state is involved.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e69ba72b-9cfc-4db8-b5c6-07147d733ba1

📥 Commits

Reviewing files that changed from the base of the PR and between eb3ec63 and 50538e6.

📒 Files selected for processing (13)

• deployment/aliyun/research/k8s/alpha-mission-job.example.yaml
• 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/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/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/alpha-explicit-execution-costs

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