Make governed GP policies deterministic across resume

[proerror77]

Change contract

Make governed GP execution fail closed on unbounded or time-based policy drift and reproduce the same candidate sequence across interrupted and uninterrupted runs by deriving each iteration RNG from the frozen seed and iteration.

Issue relationship

Refs #599

Out of scope

Factor Bank evidence binding and publication; mission-execute wiring; MCTS subset search; continuous tuning; sealed-holdout opening; Paper, Shadow, LiveSmall, deployment, runtime activation, or new services.

Dependencies and merge order

Core PR #645 is merged. This PR is now based directly on main; merge it before Evidence PR #648 and Mission PR #646.

Focused validation

• governed_gp_policy_rejects_unadmitted_fields_and_operators — passed.
• governed_gp_resume_matches_the_uninterrupted_sequence — passed.
• cargo +1.91 test -p alpha-domain -p alpha-engine --locked — 46 domain and 81 engine tests passed; one credential-dependent LLM test ignored as designed.
• Scoped Clippy with -D warnings, exact-file Rustfmt, git diff --check, and agent-worktree preflight — passed.
• Standards review found no hard violations or material smells; Issue Run controlled GP screening into an immutable CEX Factor Bank #599 Spec review found no missing or wrong behavior in this bounded layer.

Rollout and rollback

Research-domain and GP-engine behavior only; no runtime mutation. Roll back by reverting this PR before its dependent Factor Bank PRs.

Scope exception

None.

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Review details

⚙️ Run configuration

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Run ID: 4bf3527d-fe69-41ca-83c1-59c711a6fc2f

📥 Commits

Reviewing files that changed from the base of the PR and between 4aa43ef and 17806c5.

📒 Files selected for processing (2)

• rust_hft/alpha-harness/domain/src/lib.rs
• rust_hft/alpha-harness/engine/src/engines/gp.rs

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