Clarify compact C++ formatting guidance

[Copilot]

This is a clarification for contributors, to explain that we prefer "all parameters on the same line" for source code readability.
(based on some extreme examples in #5833)

• Guidance: Prefer compact function parameter lists and if conditions; allow multiline parameters when lists are very long.
• Examples: Add bad/good examples to CONTRIBUTING.md, positioned immediately before the Comments guidelines.
• Agent instructions: Add the matching preference to AGENTS.md.

// Preferred
void setColor(uint8_t red, uint8_t green, uint8_t blue);

if (enabled && segment.isActive() && color != 0) {
  setColor(red, green, blue);
}

AI assistance: yes. for writing up everything into concise statements.

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[softhack007]

@coderabbitai full review

[softhack007]

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[Copilot]

Copilot review overview

🟢 Approval recommended

The documentation-only changes are consistent, clear, and aligned with the stated purpose.

Review effort: Balanced
Findings: None

What changed in this PR

Clarifies WLED’s preferred compact C++ formatting for function parameters and conditional expressions.

Changes:

• Documents compact formatting with good and bad examples.
• Aligns contributor, C++ review, and agent guidance.

File	Description
CONTRIBUTING.md	Adds formatting guidance and examples.
docs/​cpp.instructions.md	Adds the C++ formatting rule.
AGENTS.md	Aligns agent instructions with contributor guidance.

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[softhack007]

PR closed by accident 😅

[softhack007]

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