batpak 0.2.0

Event sourcing with causal graphs and policy gates. Sync API, zero async.
Documentation 
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- id: FLOW-APPEND
  summary: Root-cause append goes through store append path, writer commit protocol, and persistence.
  artifacts:
    - ART-STORE-MOD
    - ART-STORE-INTEGRATION
    - ART-OBSERVABILITY-TESTS
- id: FLOW-APPEND-OPTIONS
  summary: Append with CAS/idempotency/correlation options enforces guards before commit.
  artifacts:
    - ART-STORE-MOD
    - ART-STORE-PROPERTIES
- id: FLOW-APPEND-REACTION
  summary: Causal follow-up appends preserve correlation and causation IDs while emitting distinct telemetry.
  artifacts:
    - ART-STORE-MOD
    - ART-OBSERVABILITY-TESTS
- id: FLOW-WALK-ANCESTORS
  summary: Ancestor traversal follows hash links when available and falls back to deterministic clock order otherwise.
  artifacts:
    - ART-STORE-ANCESTORS
    - ART-STORE-ADVANCED
- id: FLOW-PROJECT
  summary: Project checks cache capability, optionally prefetches, validates freshness, and replays on miss.
  artifacts:
    - ART-PROJECTION
    - ART-STORE-PROJECTION-FLOW
    - ART-PROJECTION-TESTS
    - ART-OBSERVABILITY-TESTS
- id: FLOW-REACT
  summary: Reactive loop subscribes, loads source events, emits derived reactions, and appends them causally.
  artifacts:
    - ART-STORE-MOD
    - ART-STORE-ADVANCED
- id: FLOW-SYNC
  summary: Explicit sync hands control to the writer and returns only after the writer acknowledges durability work.
  artifacts:
    - ART-STORE-MAINTENANCE
    - ART-OBSERVABILITY-TESTS
- id: FLOW-SNAPSHOT
  summary: Snapshot syncs first, then copies the sealed on-disk segment set into a destination directory.
  artifacts:
    - ART-STORE-MAINTENANCE
    - ART-OBSERVABILITY-TESTS
    - ART-REPLAY-TESTS
- id: FLOW-COMPACT
  summary: Compaction syncs, merges sealed segments, rebuilds the index, and preserves observable store truth.
  artifacts:
    - ART-STORE-MAINTENANCE
    - ART-REPLAY-TESTS
    - ART-ADR-COMPACTION
- id: FLOW-WATCH-PROJECTION
  summary: Watch-projection subscribes to entity events and re-projects on each notification, returning updated state to the caller.
  artifacts:
    - ART-STORE-MOD
    - ART-STORE-PROJECTION-FLOW
    - ART-UNIFIED-TESTS
- id: FLOW-CLOSE
  summary: Close routes shutdown through the writer so outstanding work drains before the store exits.
  artifacts:
    - ART-STORE-MAINTENANCE
    - ART-OBSERVABILITY-TESTS