Module seams 

Seam traits (spec 002, 3.1.2, amended by spec 003, 3.2.6; design section 8), declared as signatures over std::future only. The runtime (spec 003) composes them. They are transport-neutral; network implementations live under integrations/ (spec 001, 3.4.3).

Nothing here reads a clock, performs I/O or spawns: time reaches a seam as a remaining duration, and cancellation as a CancelSignal.

Structs

AcquireCall

One acquisition attempt, with the core’s canonical request and identity.

AcquireReport

Raw page bytes are always validated by the core before becoming values.

AttemptCall

One dispatched attempt (spec 003, 3.2.6).

AttemptReport

What one attempt produced, what it cost and how cancellation went.

BatchAttemptCall

One general batch dispatch. Member order is stable and evidence-visible.

BatchAttemptReport

One backend-wide batch report. A top-level failure is attributed to every dispatched member. The batch charge is allocated by the plan policy.

BatchCapability

A backend’s explicit declaration that one projection may participate in a general runtime batch. Equal compatibility identifiers mean the backend promises compatible semantics. Work units are backend-defined and are used only against the plan’s hard max_backend_work bound.

BatchMemberCall

One owned member of a general runtime batch.

BatchMemberReport

A member result is keyed by attempt id. Duplicate, unknown, or missing ids are malformed for the affected member and never fill another member.

CallContext

Passed to every seam call. Time is a value, not a clock read.

CancelSignal

A one-way, clonable cancellation signal with children, using std only. Raising a signal raises every child created from it; a child can be raised alone.

DynamicCall

One dynamic question’s single attempt (spec 019, 3.5).

DynamicReport

What a dynamic attempt produced, who served it, what it cost and how cancellation went. Invalid answers are judged by the core.

Enums

AcquisitionFailure

AdapterFailure

How an adapter says an attempt failed. Invalid outputs are judged by the core, not reported here.

CancelAck

The adapter’s answer to a raised cancellation signal.

RemoteEnd

Whether remote work may outlive a report the adapter returned of its own accord (spec 013, 3.1).

Traits

AcquisitionSource

An acquisition adapter. Dispatch belongs to the caller, never to the core. Its future uses only std and has no executor or runtime dependency.

ContextSource

Supplies an authorized context snapshot. Returns only what the caller may read; a missing field is reported missing, never filled.

DecisionBackend

Answers semantic requests. States its capabilities and its cost; never manufactures a distribution or a calibration claim.

DynamicBackend

Answers dynamic questions (spec 019, 3.4). Separate from DecisionBackend: implementing that trait never makes a backend dynamic, and a backend answers only when it returns a dynamic capability. It is offered no tool, function or retrieval surface.

DynamicEvidenceSink

Receives dynamic outcomes (spec 019, 3.6). A receipt establishes that the sink accepted the outcome under its own durability terms, nothing more.

Evaluator

A task adapter producing an evaluation report envelope (R-06).

EvidenceSink

Receives run records (spec 003, 3.9). A receipt establishes that the sink accepted the record for its decision id under the sink’s own durability terms, nothing more.

Type Aliases

BoxFuture

A boxed future, so the traits stay object-safe without an executor.