The ConfigReloadCluster Cluster impl — breathe's CONFIG-FILE-RELOAD I/O boundary. The hands that carve a `key = value` config line and trigger the matching reload (pgbouncer RELOAD, nginx/PostgreSQL SIGHUP, or a deferred restart) for a LimitLayout::ConfigFile band. Mirrors HostCluster; reuses the one BandProvider. Side effects abstracted behind the ConfigReloadEnv trait (the typed-spec-triplet testability seam).

The self-describing breathe dimensions catalog (CATALOG REFLECTION). Adding a dimension REQUIRES a catalog row in the same change; the reflection tests fail the build otherwise.

The concrete breathe DimensionDescriptors (memory/storage/cpu) — the small, genuinely dimension-specific data driving the one generic BandProvider. Adding a dimension is a descriptor here + a catalog row; zero orchestration.

Validated-resource admission — the phantom-typestate FSM + the Admitido<T> proof-carrying wrapper + the Viveiro pool that makes an unvalidated resource UNREPRESENTABLE in the valid pool (docs/PROVISIONING.md §2.3).

Shikumi-backed service configuration for breathe — the BreatheServiceConfig root whose typed `scale` section (store/cache/coordination + bounded knobs) selects the elasticity tier BY CONFIG, never a hidden fallback. prescribed_default is the VERY-SMALL tier (in-memory, no cache, single replica), byte-identical to today; the EXTREME tier (Postgres/Redis/sharding) is the same root with different enum arms (M2/M3/M4). M1 of the Urdume-microservice refactor; see docs/BREATHE-MICROSERVICE.md.

The ResourceProvider + Cluster traits — the non-overloadable, category-atomic I/O boundary every breathe dimension implements (theory/BREATHE.md §3). No controller dependency.

RedDB wire protocol vocabulary: connection-string parser, RedWire frames, payload codecs, topology, sanitizers, and replication messages.

RedDB file artifact layer: single-file .rdb layout, WAL, snapshots, checkpoints, locks, and recovery.

RedDB Query Language (RQL) front-end + conformance authority (ADR 0053). Owns the sqllogictest-format conformance suite whose truth comes from the public SQLite corpus; depends only on reddb-io-types.

High-performance graph database with ACID transactions, MVCC time-travel, and Arrow analytics

The durable-store seam for breathe — DecisionLog (the single counter-accumulation fold + the append-only decision feed) + SampleCache (the predictive prior sample). An in-memory tier (today, byte-identical to the CRD-status projection) and (M2/M3) a Postgres/Redis tier behind the same `&dyn` seam: one config switch selects the backend; the band law and reconcile loop never change. See docs/BREATHE-MICROSERVICE.md.

High-performance native Vulkan 1.3 rendering backend and Smithay Renderer adapter with full HDR10 / scRGB color management and zero-copy DMA-BUF

Decides whether a node is earning its cost. The node-level signal breathe never had: every band dimension carves WITHIN a host, so nothing ever answered whether the host itself should exist.

retirada's spot-reclaim signal applied to job-shaped (CI) workloads: classify a GH Actions runner-pod loss as a legitimate auction-ether reclaim vs a real failure, and (only for the former) redispatch that one job onto the existing on-demand runner override -- never a blanket retry, never a fresh spot pool for the retry.

Which bands SHOULD exist, derived from observed workload shape. The answer to hand-authored enrollment: a total function from shape to dimension set, so a dimension nobody thought of is a compile error rather than a silent zero.