Module agents 

install (#232): write the testing contract into the repository’s agent context file (AGENTS.md) as a marker-delimited, hash-versioned block — the beads (bd init) pattern. Idempotent: re-running refreshes the owned region and touches nothing outside it.

Functions

install

Upsert the managed block into the file at path: create the file when absent, append when the markers are missing, otherwise replace only the region between the markers. A current block is a byte-identical no-op.