Primitives

Scepter is organized by concern.

Module	Purpose
`key`	Ordered key encoding with `LexicographicKey` and `KeyEncoder`.
`model`	Schema-rich time-series types and location resolution.
`shard`	Range assignment, load scoring, lookup, and splitting.
`hint`	Compact field-hint indexes for query fanout pruning.
`distribution`	Bucket layouts, distributions, exemplars, percentiles, and deltas.
`aggregate`	Distributed aggregation traits and basic reducers.
`collect`	Bucketed delta aggregation with admission windows.
`ingest`	Write envelopes, stale-write policy, and range routing.
`query`	Logical plans, fanout plans, and pushdown fragments.
`reliability`	Replica selection and partial-result health metadata.
`standing`	Periodic standing queries and stable evaluator sharding.
`arrow`	Optional Apache Arrow batch exporters.
`compressed`	Optional Roaring-backed numeric field-hint index for dense set operations.
`wire`	Optional CBOR and Zstd helpers.

Use the crate root re-exports for common workflows:

use scepter::{FieldHintIndex, FieldPredicate, RangeAssigner};

let mut ranges = RangeAssigner::new();
ranges.assign(b"a".to_vec()..b"m".to_vec(), "leaf-1")?;

let mut index = FieldHintIndex::new();
index.insert_value("ComputeTask", "job", "monarch", "leaf-1");

let candidates = index.candidates(
    "ComputeTask",
    "job",
    &FieldPredicate::Equals("monarch".to_owned()),
);

assert!(candidates.contains("leaf-1"));

Ok::<(), scepter::ShardError>(())