Composable MarTech Is Not a Stack, It Is a Contract

Thesis\n\nEvery composable stack is only as durable as the schema contract between its parts.\n\n## Three contracts that matter\n\n1. Identity contract — one resolution authority, versioned.\n2. Event contract — a single semantic event registry.\n3. Consent contract — consent state travels with the identity, always.\n\nTeams that skip step three rebuild the whole stack within eighteen months.