readme instructions files

jal-co/shieldcn

Instructions file CodexOpenCode

Instructions for jal-co/shieldcn, covering agents.md — shieldcn, what this is, monorepo structure, packages/core (@shieldcn/core) and packages/web (@shieldcn/web).

Iron-Mark/Iron-Mark

Instructions file CodexOpenCode

AGENTS.md instructions for Iron-Mark/Iron-Mark, covering agents.md — working in this repository, what this repo is, identity — read this first, branch flow and automation (runs unattended — do not "fix" it casually).