airflow-foundationlisted

# Apache Airflow: Airflow Scheduler & Triggerer Foundation ## Foundation contract This is a cold, source-specific foundation, not an operational procedure. It is historical, revision-pinned evidence rather than timeless guidance. Current project source, tests, requirements, and runtime behavior outrank this projection and decide what ships. ## Provenance and revision - Source record: `airflow`; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index. - Recorded revision: `main@a4b6b77e6832a0047d6857544a927b3108e7ed94`. - Full provenance, coverage caveats, boundaries, and preserved evidence: `references/index.md`. ## Topic map - Representative topics: Loop & transactions; Queueing critical section; State machines; Recovery & watchdogs; Triggerer plane. - Scope and retrieval questions: `references/index.md#use-this-for`. - Complete capsule chooser: `references/index.md#load-the-matching-source-dump`. - Detailed grouped map: `references/index.md#capsule-map`. - Source limitations and portability boundaries: `references/index.md#boundaries`. ## Retrieval Open the index, choose one capsule matching the active question, and load only that capsule. Revalidate its cited source and revision before relying on it. Do not bulk-load the inventory, treat historical claims as current truth, or apply this foundation as a procedure.