docs: add descriptive step names to all example workflows

[clouatre]

Summary

Adds descriptive step names to all example workflows for improved clarity and readability.

Changes

Added step names to all 3 example files:

tier1-maximum-security.yml (3 names)

• name: Checkout
• name: Setup Goose CLI
• name: Upload Analysis Artifact

tier2-balanced-security.yml (5 names)

• name: Checkout
• name: Setup Goose CLI
• name: Upload Review Artifact
• name: Download Review Artifact
• name: Post Review Comment

tier3-advanced-patterns.yml (3 names)

• name: Checkout
• name: Setup Goose CLI
• name: Upload Review Artifact

Why

• Improves readability and debugging experience
• Aligns with README Quick Start naming conventions
• Makes examples more educational and easier to follow
• Consistent naming across all examples

Testing

• ✅ Verified YAML syntax is valid
• ✅ Step names align with README patterns
• ✅ No functional changes, only naming improvements