docs(java): document the expanded SDK surface

[pratyush618]

What

Updates sdks/java/README.md to document the SDK surface shipped since the last README refresh — everything now on master:

• Baseline Java 17 (--release 17); Spring Boot 3 apps can adopt it.
• Workflow engine: DAG, fan-out/fan-in, gates, conditions, sub-workflows, sagas, analysis/visualization, canvas.
• Worker resources (DI), enqueue predicates, KEDA scaler endpoint, producer batching, in-process autoscaling.
• Observability contrib (Micrometer Observation + Sentry) and MessagePack serializer — optional compileOnly deps.
• Spring Boot 3 starter (org.byteveda:taskito-spring).

Docs-only; no code change.

Summary by CodeRabbit

• Documentation
  • Updated the Java SDK README to reflect completed support for the SDK and a newer Java baseline.
  • Expanded the documented feature set to include additional workflow capabilities, batching, autoscaling, observability, and Spring Boot support.
  • Improved the package and project overview to better describe available modules and subprojects.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ead2d4a6-6f0c-46c5-9351-e2655b6b36f1

📥 Commits

Reviewing files that changed from the base of the PR and between b973200 and d5eff5a.

📒 Files selected for processing (1)

• sdks/java/README.md

📝 Walkthrough

Walkthrough

This PR updates the Java SDK README documentation, revising the supported Java baseline to 17, expanding the build-out status list, adding workflow-engine feature documentation, adding new Usage sections, and updating the package structure diagram and subprojects list.

Changes

README Documentation Update

Layer / File(s)	Summary
Overview and status update sdks/java/README.md	Java baseline updated from 11+ to 17+, with refreshed build-out status and feature bullets (MessagePack, worker resources, enqueue predicates, KEDA scaler endpoint, batching, autoscaling, observability, Spring Boot 3 starter).
Workflow feature documentation sdks/java/README.md	Documents additional workflow constructs (approval gates, conditions, sub-workflows, sagas) and extends coverage of workflow analysis/visualization and canvas concepts.
Usage section additions sdks/java/README.md	Adds new Usage subsections for worker resources (DI/scoping), enqueue predicates, producer batching, autoscaling and scaler endpoint, observability, MessagePack, and Spring Boot 3 starter configuration.
Package structure and subprojects update sdks/java/README.md	Revises the package/module diagram to include error hierarchy and new feature packages, and updates the Subprojects list (:processor, :test-support, :spring, :graalvm-smoke).

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the documentation update for the expanded Java SDK surface.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/java-sdk-readme

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@sdks/java/README.md`:
- Around line 6-16: The status blockquote in the Java README contains an empty
line that triggers markdownlint MD028. Update the README content in the status
section so the quoted lines stay contiguous, either by removing the blank line
or restructuring the blockquote, and keep the rest of the text unchanged.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9302e543-7d17-48d9-b9f9-cb41ef698e4a

📥 Commits

Reviewing files that changed from the base of the PR and between a2c0186 and b973200.

📒 Files selected for processing (1)

• sdks/java/README.md