chore(release): bump version to 0.4.20

[lavaman131]

Release 0.4.20

This release includes a major architectural update to the workflow system along with several important improvements.

🚨 Breaking Changes

This release includes breaking changes from the workflow SDK update (#304). The event bus streaming architecture introduces a new unified workflow SDK that may require updates to existing workflow implementations.

✨ Key Features & Improvements

• Event Bus Streaming Architecture: Complete rewrite of the workflow system with a unified SDK supporting event-based streaming
• Playwright CLI Skill: New skill for browser automation, web testing, form filling, and screenshot capture
• Planner Agent: New agent type for creating detailed execution plans
• Enhanced Sub-Agent Handling:
  • Fixed redundant task display when agent tree is present
  • Deduplication of sub-agent entries in parallel agents tree
  • Proper background vs foreground agent tree rendering
  • Session ID registration for OpenCode sub-agents

🐛 Bug Fixes

• Fixed OpenCode SDK tool event routing by registering sub-agent session IDs
• Fixed tool completion for tools with undefined output
• Improved autocomplete by filtering build artifacts (target/, build/, dist/, out/, coverage/)
• Fixed text chunking loss after sub-agent blocks
• Prevented orphaned text fragments in UI output
• Enhanced text delta merging into finalized TextParts

📝 Configuration Updates

• Updated agent configurations across Claude, GitHub Copilot, and OpenCode SDKs
• Enhanced skills documentation and reference materials
• Improved research-codebase and explain-code skills

🔗 Related

• Includes all changes from feat(workflows)!: implement event bus streaming architecture and unified workflow SDK #304: feat(workflows)!: implement event bus streaming architecture and unified workflow SDK

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Full Changelog: v0.4.19...v0.4.20

[claude]

PR Review: Release 0.4.20

Summary

This is a straightforward version bump PR from 0.4.19 to 0.4.20 in package.json.

Review

Category	Status	Notes
Code Quality	✅ Pass	Clean, minimal change - exactly what a version bump should be
Potential Bugs	✅ None	Single-line version change with no logic
Performance	✅ N/A	No runtime impact
Security	✅ No concerns	No security-sensitive changes
Test Coverage	✅ N/A	Version bumps don't require test changes

Observations

1. Change is minimal and correct: Only the version field is modified, which is the expected behavior for a release PR.

2. Semantic versioning: The patch version increment (0.4.19 → 0.4.20) follows semver conventions appropriately for a release.

3. No changelog: The repository doesn't appear to maintain a CHANGELOG file. Consider adding one in the future to document what changes are included in each release - this helps users understand what's new or fixed.

Verdict

✅ Approved - This PR is ready to merge. It's a clean version bump with no issues.