Created MAC governance skills and publication model
- Added the shared
.codexcontext and reusable cross-repo skills that now live inmacinstead of being duplicated informally across product repos. - Defined the publication split between source doctrine in
mac, published product/governance docs inmac-docs, and thin local.codexlayers in product repos. - Pilot-aligned
mac-cli,mac-core, andmac-mcpwith the new governance source model.