L08-02 — Build deterministic no-provider policy over the same action space #62

Outcome

Implement a rules-only policy that answers the same #61 questions (operation head plus target heads, typed choices, reason codes) for selected tasks: explanation, eligible-route ordering, and safe-next-action fallback. The provider port treats it as one more provider, so a model can replace it without any consumer change. This is the parity baseline every model candidate in #63 must beat per task.

Parent and boundary

Parent: #9. Owner: proposed Decision module. This issue owns one bounded slice of Bounded Decision Worker; consume accepted upstream contracts and keep PDF/verdict/publication authority with Core.

Acceptance

• The offline product stays useful, and every output cites Core evidence by row index.
• Rules emit degenerate but valid distributions (or ABSTAIN with a reason) that pass the L08-01 — Define indexed decision state and one-request question contract #61 validator unchanged.
• Failure case: provider absence cannot suppress a manual path or invent technical claims. A consumer that branches on "rules vs model" instead of the typed answer fails.

Required proof

No-provider parity tests (same request → same validated observation shape as a model provider) and evidence-citation tests. Record the exact source SHA, test command or hosted run, fixture/artifact identity, and any skipped or unavailable lane. Run the repository's mapped proof and check-change gate for a PR.

Handoff

Record changed files, observed result, remaining risk, and a 1–3 sentence anti-slop review. Completion means acceptance evidence, not merely a merged implementation.

Sources

Approved master roadmap · Legacy/research input (legacy #584) · North Star: jev-ultrafast@1231850a; see the translation table in #9.

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