- ApprovalStep now has candidates + ApprovalPolicy (ANY/ALL) instead of a single assignee; ApprovalStep.single(...) kept as a convenience factory for the single-approver case
- AssigneeResolver resolves per-candidate; TaskStatus gains SKIPPED for auto-skipped sibling tasks
- DefaultOrdoEngine creates one task per candidate and advances per-step according to policy (ANY: first approval wins and skips the rest, only rejects once everyone rejects; ALL: fail-fast on first rejection, only advances once everyone approves)
- Added ApprovalTaskRepository.findByInstanceIdAndStepId and JDBC/in-memory implementations
- Added V2 migration: ordo_approval_step.policy column + ordo_step_candidate table
- Updated ApprovalStepMapper/ApprovalTaskMapper/JdbcProcessDefinitionRepository for the new schema, handling null action for SKIPPED tasks
- Migrated all call sites (tests, ordo-example, rhizome demo) to ApprovalStep.single(...) and the 3-arg AssigneeResolver
- Added ANY/ALL policy test coverage; fixed JdbcTestSupport to apply the V2 migration and strip SQL comments before splitting on ';'
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