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feat: initial approval workflow engine with in-memory and JDBC storage

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Lightweight linear approval engine (v0.1):

- ordo-api: domain model, OrdoEngine port, repository SPI with
  conditional updates (insertIfAbsent, completeIfPending) and a
  TransactionExecutor port for atomic multi-step writes
- ordo-core: DefaultOrdoEngine running register/start/approve/reject
  inside a transaction boundary; in-memory engine and repositories
- ordo-storage-jdbc: thread-bound JDBC transactions, normalized V1
  schema migration, Jackson-based ProcessContext JSON codec
- tests: unit tests plus H2 integration tests; PostgreSQL integration
  tests run against a local instance via ordo.test.pg.* properties and
  skip when unreachable

Co-Authored-By: Claude Code <noreply@anthropic.com>
This commit is contained in:
0264408
2026-09-08 16:56:04 +08:00
co-authored by Claude Code
commit 397a9c229b
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