feat(java): enqueue decision gates and recipes

[pratyush618]

What

Generalizes enqueue predicates into a richer gate that returns a decision, and adds reusable recipes — while keeping the boolean predicate(...) API working.

• Sealed EnqueueDecision (org.byteveda.taskito.predicates): Allow / Skip(reason) / Defer(delay) / Reject(reason), with factories (incl. deferUntil(Instant)).
• EnqueueGate functional interface — decide(PredicateContext) → EnqueueDecision. Taskito.gate(taskName, gate) registers one; predicate(...) now folds into a gate (true → Allow, false → Reject) so both share one gates map.
• Evaluated at the single enqueue point after interceptors and onEnqueue middleware (so gates see the payload that will actually be enqueued — first non-Allow wins): Reject → PredicateRejectedException; Skip → no job; Defer → applies the delay to the final options.
• API: enqueue() throws EnqueueSkippedException on Skip; tryEnqueue() returns Optional<String> (empty on skip). Batch enqueueMany requires Allow (Skip/Defer can't be expressed per-item in one all-or-nothing batch → error), Reject fails the batch.
• Recipes — businessHours / timeWindow / dayOfWeek (defer to next open window), payloadMatches / featureFlag (skip), over a BooleanFlag seam.

Test

EnqueueDecisionTest (each outcome + tryEnqueue/enqueue behavior) and RecipesTest (each recipe).

./gradlew build green (JDK 17 build leg + 21/25 test legs).

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c2f8a428-82b6-46b4-85e7-d819872d4b75

📥 Commits

Reviewing files that changed from the base of the PR and between c0bc4cc and abe33a5.

📒 Files selected for processing (9)

• sdks/java/src/main/java/org/byteveda/taskito/DefaultTaskito.java
• sdks/java/src/main/java/org/byteveda/taskito/Taskito.java
• sdks/java/src/main/java/org/byteveda/taskito/errors/EnqueueSkippedException.java
• sdks/java/src/main/java/org/byteveda/taskito/predicates/BooleanFlag.java
• sdks/java/src/main/java/org/byteveda/taskito/predicates/EnqueueDecision.java
• sdks/java/src/main/java/org/byteveda/taskito/predicates/EnqueueGate.java
• sdks/java/src/main/java/org/byteveda/taskito/predicates/Recipes.java
• sdks/java/src/test/java/org/byteveda/taskito/EnqueueDecisionTest.java
• sdks/java/src/test/java/org/byteveda/taskito/RecipesTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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