feat(java): static-DAG workflows + package-by-feature reorg

[pratyush618]

Sixth of the Java SDK split series (follows #304). Static-DAG workflows over the JNI core, plus a package-by-feature reorganization of the root package.

What's here

• Static-DAG workflows: a workflows cargo feature on taskito-java (pulls taskito-workflows) + 4 native fns — submit (builds the dagron DAG from the steps JSON), markNodeResult, getStatus, cancel. Java workflows/ package: a Workflow/Step builder, WorkflowRun.await, WorkflowStatus/NodeSnapshot, WorkflowState/NodeStatus enums, and a host-side WorkflowTracker. Queue.submitWorkflow/workflowStatus/cancelWorkflow + Worker.Builder.trackWorkflows(). Steps run in topological order; the tracker advances node/run state from worker outcomes.
• Package-by-feature reorg (refactor(java): organize root package by feature): the root org.byteveda.taskito package now holds only the front door (Taskito, Queue, DefaultQueue, TaskitoException); everything else moves into feature subpackages (task, model, worker, locks, scheduling, alongside the existing workflows, serialization, middleware, etc.). Pure structural move — AWS-v2/Stripe convention.

Verification

Full ./gradlew build --no-daemon passes: cargo build --features postgres,redis,workflows + compile + Spotless + Checkstyle + tests, native bundled. The Java CI job (added in #304) runs the same command.

Conflict note: the reorg moved JobStatus into the model package; its fromWire (hardened in #299 to throw TaskitoException) needed an import org.byteveda.taskito.TaskitoException after the move. Folded into the reorg commit so no commit leaves the build broken.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 643c3f03-3991-415d-8db7-bf9da14737aa

📥 Commits

Reviewing files that changed from the base of the PR and between a3c6416 and 3e0e318.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (56)

• .github/workflows/publish-java.yml
• crates/taskito-java/Cargo.toml
• crates/taskito-java/src/backend.rs
• crates/taskito-java/src/error.rs
• crates/taskito-java/src/ffi.rs
• crates/taskito-java/src/lib.rs
• crates/taskito-java/src/workflows/mod.rs
• sdks/java/README.md
• sdks/java/build.gradle.kts
• sdks/java/src/main/java/org/byteveda/taskito/DefaultQueue.java
• sdks/java/src/main/java/org/byteveda/taskito/Queue.java
• sdks/java/src/main/java/org/byteveda/taskito/cli/Cli.java
• sdks/java/src/main/java/org/byteveda/taskito/dashboard/Contract.java
• sdks/java/src/main/java/org/byteveda/taskito/dashboard/DashboardServer.java
• sdks/java/src/main/java/org/byteveda/taskito/internal/JniQueueBackend.java
• sdks/java/src/main/java/org/byteveda/taskito/internal/NativeWorkflows.java
• sdks/java/src/main/java/org/byteveda/taskito/locks/Lock.java
• sdks/java/src/main/java/org/byteveda/taskito/locks/LockInfo.java
• sdks/java/src/main/java/org/byteveda/taskito/locks/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/middleware/EnqueueContext.java
• sdks/java/src/main/java/org/byteveda/taskito/model/DeadJob.java
• sdks/java/src/main/java/org/byteveda/taskito/model/Job.java
• sdks/java/src/main/java/org/byteveda/taskito/model/JobError.java
• sdks/java/src/main/java/org/byteveda/taskito/model/JobFilter.java
• sdks/java/src/main/java/org/byteveda/taskito/model/JobStatus.java
• sdks/java/src/main/java/org/byteveda/taskito/model/QueueStats.java
• sdks/java/src/main/java/org/byteveda/taskito/model/TaskLog.java
• sdks/java/src/main/java/org/byteveda/taskito/model/TaskMetric.java
• sdks/java/src/main/java/org/byteveda/taskito/model/WorkerInfo.java
• sdks/java/src/main/java/org/byteveda/taskito/model/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/scheduling/PeriodicTask.java
• sdks/java/src/main/java/org/byteveda/taskito/scheduling/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/spi/QueueBackend.java
• sdks/java/src/main/java/org/byteveda/taskito/task/EnqueueOptions.java
• sdks/java/src/main/java/org/byteveda/taskito/task/Task.java
• sdks/java/src/main/java/org/byteveda/taskito/task/TaskFunction.java
• sdks/java/src/main/java/org/byteveda/taskito/task/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/worker/RegisteredTask.java
• sdks/java/src/main/java/org/byteveda/taskito/worker/Worker.java
• sdks/java/src/main/java/org/byteveda/taskito/worker/WorkerDispatchBridge.java
• sdks/java/src/main/java/org/byteveda/taskito/worker/package-info.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/NodeSnapshot.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/NodeStatus.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/Step.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/Workflow.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/WorkflowRun.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/WorkflowState.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/WorkflowStatus.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/WorkflowTracker.java
• sdks/java/src/main/java/org/byteveda/taskito/workflows/package-info.java
• sdks/java/src/test/java/org/byteveda/taskito/DashboardTest.java
• sdks/java/src/test/java/org/byteveda/taskito/LockTest.java
• sdks/java/src/test/java/org/byteveda/taskito/QueueTest.java
• sdks/java/src/test/java/org/byteveda/taskito/WorkerTest.java
• sdks/java/src/test/java/org/byteveda/taskito/WorkflowTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/java-workflows

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