Preserve execution provenance and recover report persistence

[MaxGhenis]

Summary

• Add an engine-neutral execution receipt contract and preserve calculation provenance through household and society-wide API adapters and durable simulation outputs.
• Consolidate household calculations on the shared managed orchestrator, removing the competing legacy orchestration stack.
• Track calculation completion separately from durable persistence so failed saves can be retried without recalculating. Persist terminal errors, recover pending household reports after reload, and deduplicate concurrent finalization writes.
• Keep runtime, model, ruleset, and population identities distinct so calculator results can carry native Axiom and Populace provenance during the migration.

Validation

• Full Vitest suite: 3,232 passed, 10 skipped
• TypeScript typecheck passed
• ESLint passed
• Prettier check passed
• Website production build passed
• Calculator production build passed
• git diff --check passed

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Project	Deployment	Actions	Updated (UTC)
policyengine-app-v2	Ready	Preview, Comment	Jul 10, 2026 1:31am
policyengine-calculator	Ready	Preview, Comment	Jul 10, 2026 1:31am
policyengine-calculator-next	Ready	Preview, Comment	Jul 10, 2026 1:31am
policyengine-website	Ready	Preview, Comment	Jul 10, 2026 1:31am