feat(alpha): persist immutable CEX baseline evidence

[proerror77]

Change contract

Persist immutable Ridge/CART evidence after mission evaluation and bind it to the exact producer policy.

Issue relationship

Refs #600

Out of scope

MCTS admission, Factor-Bank subset search (#601), ACK/OSS execution, and Paper/Shadow/Live.

Dependencies and merge order

Stacked on #668. Merge after #662, #663, and #668, and before the MCTS admission PR.

Focused validation

• cargo test -p alpha-harness --locked (131 passed)
• cargo clippy -p alpha-harness --locked -- -D warnings
• cargo fmt -p alpha-harness -- --check
• create-once persistence and producer-policy binding tests pass.

Rollout and rollback

Research-only result persistence. Roll back before the dependent admission PR.

Scope exception

None.

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📥 Commits

Reviewing files that changed from the base of the PR and between 470475c and 0d36b4a.

📒 Files selected for processing (1)

• rust_hft/alpha-harness/app/src/mission_runner.rs

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