Reference module for the Headless GTM chain, not a skill to invoke. Holds the record contract every chain skill reads and writes (CONVENTIONS.md) plus the Python helpers they import (common.py, schema.py). Installed alongside the chain so those imports and references resolve; read CONVENTIONS.md whe
Reference module for the Headless GTM chain, not a skill to invoke. Holds the record contract every chain skill reads and writes (CONVENTIONS.md) plus the Python helpers they import (common.py, schema.py). Installed alongside the chain so those imports and references resolve; read CONVENTIONS.md when you need the JSONL record shape, the runs/ layout, or the cost-gate rules.