[codex] fix continuity decision domain

[akcorca]

What changed

• record the selected-formula authoring disposition alongside the cursor-entity decision in semantic-continuity observations
• explicitly route the reviewed product-shape conflict case to the selected-formula decision domain
• fail closed for unknown, duplicate, or incompatible formula-domain selections

Why

The release continuity gate treated the established cursor entity A as if it were the selected formula Ax. The engine correctly reported the entity as established and the formula as conflicting, but the legacy single-domain scorer classified that separation as a false establishment.

This keeps the formula-conflict expectation intact while making the compared decision domain explicit.

Validation

• bun test packages/evaluation/src/semantic-continuity.test.ts packages/evaluation/src/semantic-continuity-release.test.ts
• bun run continuity:release — 42/48, risk 12, no unsafe class
• bun run typecheck
• git diff --check
• bun run check passed through tests, fixtures, conformance, and native/WASM parity; local macOS arm64 RSS budget remained at the known ~152 MB versus the 117 MB Linux gate and will be verified by CI

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