feat: Add blog post on 3 infrastructure decisions that determine engineering velocity

[bobbyonmagic]

Summary

This PR adds blog post #4 from Issue #868: "The 3 Infrastructure Decisions That Determine Your Engineering Velocity"

Content Overview

Topic: Analyzes the three infrastructure decisions that have outsized impact on engineering velocity:

1. Provisioning Model: How you create infrastructure (manual → scripted → IaC → platform)
2. Environment Strategy: Dev/staging/prod topology and deployment flow
3. Deployment Surface: Where code runs (managed platforms, VMs, Kubernetes)

Key takeaways:

• Manual provisioning costs $24K/month more than Terraform at growth-stage scale
• Each approval gate costs 15-45 minutes per deployment
• Managed platforms are fastest for 90% of applications
• Complexity costs 10-20% engineer capacity per infrastructure layer
• Ephemeral PR environments provide best balance of safety and speed

Length: ~3,000 words (11 min read)
Target audience: Engineering leaders, CTOs, technical decision-makers
Tone: Pragmatic, educational, data-driven

What's Included

• Comprehensive blog post with decision frameworks and real-world scenarios
• Four provisioning maturity levels with velocity/cost analysis
• Four environment strategies with trade-offs
• Three deployment surface tiers with time-to-production estimates
• Four real-world scenario comparisons (8, 35, 120, 400+ engineers)
• Velocity decision framework with step-by-step guidance
• OG image generated
• All 4,621 tests passing

Fact-Checking Status

⏳ Comprehensive fact-check in progress - will be completed before merge

Related to Issue #868

Checklist

• Blog post written with TLDR section
• OG image generated
• All tests passing locally (4,621 tests)
• Fact-check completed
• CI checks passing
• Ready for review

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