Fix broken background in PlantUML WBS diagrams

[leonard84]

In newer PlantUML versions, BackgroundColor at the wbsDiagram {} level sets the diagram canvas background instead of the default node background. Move BackgroundColor (and RoundCorner) into node {} blocks so they correctly apply to nodes rather than the diagram canvas.

Summary by CodeRabbit

• Documentation
  • Reorganized diagram styling structure in parallel execution documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 14afa54 and 997932b.

📒 Files selected for processing (1)

• docs/parallel_execution.adoc

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📝 Walkthrough

Walkthrough

Updates PlantUML diagram styling syntax in documentation by wrapping BackgroundColor and RoundCorner properties within node selector blocks. The change standardizes CSS-like styling structure for WBS diagrams without altering semantic values or documentation content.

Changes

Cohort / File(s)	Summary
PlantUML Style Syntax Updates docs/parallel_execution.adoc	Restructured style definitions across multiple diagrams by nesting BackgroundColor and RoundCorner properties inside node { ... } selector blocks, converting from top-level declarations to nested format.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 Hop hop, the styles now nest,
Node selectors pass the test,
Colors and corners wrapped so tight,
PlantUML diagrams shine so bright! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing broken backgrounds in PlantUML WBS diagrams by restructuring style declarations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[greptile-apps]

Greptile Summary

This PR fixes PlantUML WBS diagram rendering issues in the documentation by moving BackgroundColor and RoundCorner style properties from the wbsDiagram {} level into node {} blocks. In newer PlantUML versions, these properties at the diagram level affect the canvas background rather than node styling.

• Consistently updated all PlantUML diagrams throughout docs/parallel_execution.adoc
• No functional code changes, documentation-only update
• Change ensures diagrams render correctly with newer PlantUML versions

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Documentation-only change that fixes PlantUML diagram styling for compatibility. The changes are syntactically correct, consistently applied across all diagrams, and have no impact on actual code execution
• No files require special attention

Important Files Changed

Filename	Overview
docs/parallel_execution.adoc	Moved PlantUML BackgroundColor and RoundCorner properties from wbsDiagram to node blocks for compatibility with newer PlantUML versions

_{Last reviewed commit: 997932b}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.13%. Comparing base (69ba918) to head (ac0f750).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2310   +/-   ##
=========================================
  Coverage     82.13%   82.13%           
- Complexity     4794     4795    +1     
=========================================
  Files           469      469           
  Lines         14954    14954           
  Branches       1888     1888           
=========================================
  Hits          12283    12283           
  Misses         1984     1984           
  Partials        687      687           

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