[ishandhanani]

Summary

The cuckoo module of dynamo-kv-indexer is the DC relay's pool index. Its consumers are the pool relay in lib/llm and the relay benches in lib/bench; the indexer stage itself does not use it. This change makes the module's root re-export list the relay contract and removes everything that is not part of it.

• The root list contains every item a consumer names (33) plus every type that appears in the signature of one of those items (17, found with -W unnameable_types). Submodules were already private, so an item off the list is unreachable.
• pub use adapter::* is gone. cuckoo/adapter.rs (LocalCkfAdapter and six error and report types, 547 lines) had no user anywhere in the tree, so it is deleted along with its README row.
• The three DEFAULT_GLOBAL_INGESTION_* constants leave the root; nothing outside the module reads them.
• The ingestion pool imports its sibling global module directly instead of through the root list.
• The pre-split dynamo_kv_router::indexer::cuckoo compat block (182 lines, 60 re-exports and deprecated aliases) is removed. dynamo_kv_indexer::cuckoo is the only path.
• kv-indexer host.rs header and AGENTS.md state the contract in one sentence each.

Surface	Before	After
Items reachable at dynamo_kv_indexer::cuckoo::	60	50
of which named by a consumer today	33	33
of which signature-reachable only	17	17
glob re-exports at the root	1	0
compat shims for indexer::cuckoo	60	0

Exported: CKF_LANE_COUNT, CkfBuildError, CkfConfig, PrefixSearchConfig, CanonicalSequenceBlockHash, CkfCommitState, CkfFailureAction, CkfFailureDisposition, CkfFailureDomain, CkfFailurePoint, ConsumerDrainMarker, ConsumerInstanceId, DcCkfAggregationStats, DcCkfBucketImage, DcCkfDelta, DcCkfDeltaSink, DcCkfEventOutcome, DcCkfFormatIdentity, DcCkfMemoryStats, DcCkfPublicationBatch, DcCkfPublicationStats, DcCkfPublishError, DcCkfPublisher, DcCkfRankReplacement, DcCkfSnapshot, DcCkfState, DcCkfStats, GlobalCkfAssignmentError, GlobalCkfBucketImage, GlobalCkfBuildError, GlobalCkfDelta, GlobalCkfIndexer, GlobalCkfIngestOutcome, GlobalCkfIngestionError, GlobalCkfIngestionFault, GlobalCkfIngestionPool, GlobalCkfIngestionPoolBuildError, GlobalCkfIngestionPoolConfig, GlobalCkfLaneFault, GlobalCkfLaneIngestor, GlobalCkfLaneMatch, GlobalCkfManifest, GlobalCkfQueryError, GlobalCkfQueryResult, GlobalCkfSnapshot, LaneLease, ProducerIdentity, PublisherEmitOutcome, PublisherFenceReason, PublisherSnapshotError.

Part of DYNO-197.

Validation

All with a fresh per-worktree target directory on top of origin/main 909d4ef.

• cargo fmt --all: clean.
• cargo check --workspace --all-targets --locked: one error, pre-existing on main and untouched by this change: lib/llm/tests/streaming_tool_dispatch_http.rs:87 is missing model_eos (fix(frontend): stop tool_call_dispatch handing harnesses truncated arguments ai-dynamo/dynamo#13986 vs fix(beam): finalize constrained tool calls at confirmed model EOS ai-dynamo/dynamo#17625). cargo check --workspace --lib --bins --tests --benches --examples --locked --exclude dynamo-llm: clean.
• cargo test -p dynamo-kv-indexer --locked: 594 passed, 2 ignored.
• cargo test -p dynamo-kv-router --locked: 138 + 2 passed. --all-features: 251 + 2 + 7 passed.
• cargo test -p dynamo-llm --lib pool_relay --locked: 269 passed.
• cargo clippy --no-deps --all-targets --locked -- -D warnings: clean for dynamo-kv-indexer, dynamo-kv-router, dynamo-kv-router --all-features. For dynamo-llm, --all-targets hits the same pre-existing model_eos break; --lib --bins is clean.
• cd lib/bindings/python && cargo check --locked: clean.
• bash scripts/router_layering_check.sh: 36 checks, 0 failures.
• uvx pre-commit run --files <changed files>: no failed hooks.
• Temporary #![warn(unnameable_types)] on the module: zero warnings with the final list.