chore(release): 0.20.0

[pratyush618]

Release 0.20.0 — scaling release (Tier 0 + Tier 1 batching, code-first migrations, bounded in-flight dispatch, workflow fixes).

Bumps all crates + SDK manifests to 0.20.0 (incl. sdks/java/spring, which had drifted to 0.18.0), syncs Cargo.lock, and adds the 0.20.0 CHANGELOG section (+ regenerated docs changelog and version badge).

After merge, tag from master: 0.20.0 (PyPI), node-v0.20.0 (npm), java-v0.20.0 (Maven Central).

Summary by CodeRabbit

• New Features

  • Added code-first migrations with versioning, idempotency, and automatic discovery.
  • Improved batching and fan-out performance.
  • Added bounded in-flight dispatch to manage worker capacity.
  • Polling now processes all ready work per wake-up.

• Bug Fixes

  • Improved worker fairness and retry handling.
  • Prevented duplicate workflow step execution.
  • Improved recovery from transient claim errors.
  • Ensured batch claims complete atomically.

• Improvements

  • Added jittered retry and rescheduling backoff.
  • Reduced unnecessary scheduler wake-ups.
  • Updated the release to version 0.20.0.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 052f287d-38a4-4413-ab6f-4dcf0c5b53f8

📥 Commits

Reviewing files that changed from the base of the PR and between c82f91b and b3e7237.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (18)

• CHANGELOG.md
• crates/taskito-core/Cargo.toml
• crates/taskito-core/src/scheduler/mod.rs
• crates/taskito-java/Cargo.toml
• crates/taskito-mesh/Cargo.toml
• crates/taskito-node/Cargo.toml
• crates/taskito-python/Cargo.toml
• crates/taskito-workflows/Cargo.toml
• docs/app/lib/version.ts
• docs/content/docs/resources/changelog.mdx
• sdks/java/build.gradle.kts
• sdks/java/graalvm-smoke/build.gradle.kts
• sdks/java/processor/build.gradle.kts
• sdks/java/spring/build.gradle.kts
• sdks/java/test-support/build.gradle.kts
• sdks/node/package.json
• sdks/python/pyproject.toml
• sdks/python/taskito/__init__.py

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📝 Walkthrough

Walkthrough

The release updates scheduler in-flight wake behavior and bumps project, SDK, documentation, and changelog versions to 0.20.0.

Changes

0.20.0 release update

Layer / File(s)	Summary
Scheduler capacity notification crates/taskito-core/src/scheduler/mod.rs	release_in_flight now notifies the poller only when removing a job frees capacity from a full in-flight set.
Release metadata and documentation crates/*/Cargo.toml, sdks/*, docs/..., CHANGELOG.md	Version metadata and changelog entries are updated for release 0.20.0. The documentation records migration, batching, dispatch, retry, fairness, workflow, claim, and transaction changes.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: storage

🚥 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 clearly identifies this as the 0.20.0 release and matches the version bump and changelog updates in the PR.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/release-0.20.0

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