chore: add coding guidelines rule

[nicomiguelino]

User description

Adds a new Claude rule file for general coding guidelines.

• Early returns: handle edge cases first, then main logic
• Flat code: minimize nesting via guard clauses and early exits

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PR Type

Documentation

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Description

• Add shared coding guidelines document

  • Define Early Returns principle
  • Define Flat Code principle

• Include good and avoid examples

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Diagram Walkthrough

flowchart LR
  cg["Coding Guidelines"]
  er["Early Returns"]
  fc["Flat Code"]
  ex["JavaScript examples"]
  cg -- "includes" --> er
  cg -- "includes" --> fc
  er -- "illustrated by" --> ex
  fc -- "illustrated by" --> ex

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File Walkthrough

	Relevant files
Documentation	coding-guidelines.md Add reusable coding guideline rule document                            .claude/rules/coding-guidelines.md Add new Coding Guidelines rule document Describe early return patterns to reduce nesting Describe flat code practices using guard clauses Provide good versus avoid JavaScript examples +67/-0

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 4628d8c)

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⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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Persistent review updated to latest commit 4628d8c

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[Copilot]

Pull request overview

Adds a new Claude rule file documenting general coding guidelines intended to apply across languages, focusing on reducing nesting and improving readability through guard clauses.

Changes:

• Add an “Early Returns” guideline with good/avoid examples
• Add a “Flat Code” guideline with good/avoid examples

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