Adds a new agentic workflow (.github/workflows/markdown-linter.md) that
runs Super Linter on weekdays at 2 PM UTC and on manual dispatch. The
agent analyzes linter output and creates GitHub issues with categorized
findings, severity breakdown, and fix recommendations.
Adapted from https://github.com/githubnext/agentics/blob/main/workflows/markdown-linter.md
with repo-specific conventions: PAT pool rotation, fork protection,
pinned action SHAs, scoped bash tools, and safe-outputs.
Amaury Levé