Problem

Two CI checks fail on every PR:

1. Markdown Lint — workflows/sdlc.md has blank-line violations (MD022, MD032) in the Deploy and Monitor sections
2. Link Check (lychee) — site/index.html and docs contain links to https://github.com/me2resh/apexstack which returns 404 (private repo)

Fix

1. Add missing blank lines in workflows/sdlc.md
2. Configure lychee to exclude self-referential repo links (.lycheeignore or workflow config)