internal/

Package jobengine is what framework/app/jobs plugs into kit: the scheduler the framework's jobs run on — the SDK's scheduler, on the app's clock — and the schedules it reads from a job's declaration, a period or a five-field cron expression (ADR 0179 §1, step 7).

Package mailengine is what framework/app/mail plugs into kit: the outbox the framework's mailers keep — the SDK's mail spool, on the database that keeps the mailer's service in the queue subsystem's sealed broker, else in the data directory or in memory — and the transports that empty it, the SDK's SMTP transport and its capture transport (ADR 0179 §1, step 6).

Package otlpengine is what framework/app/otlp plugs into the framework: the export app.OTLP declares — the product's spans and the metrics the framework derives from them, each signal kept in a durable queue of its own (the SDK's app/forward over its data/queue, in the data directory, else in memory) and forwarded to an OpenTelemetry collector over OTLP/HTTP, or to the product's own sender (issue #483, ADR 0185).

Package plug is where the framework's opt-in subsystems plug in: the HTTP engine, the frontends' file server and the process sampler of the runtime graph (framework/app/server), the Studio — the tool's variables, its routes and the framework's sentences in the languages after English (framework/app/studio) —, the stores and the databases (framework/app/store), the queues (framework/app/queue), the workflows (framework/app/workflow), the mailers (framework/app/mail), the jobs (framework/app/jobs).

Package queueengine is what framework/app/queue plugs into kit: the brokers the framework's consumers' queues run on — the SDK's queue in memory, in the data directory and over SQL, a mailer's outbox on a database sealed in front of the SQL one —, the consumer that delivers them, and the migration of a queue's table (ADR 0179 §1, step 4).

Package serverengine is what framework/app/server plugs into kit: the HTTP engine an app in the server profile serves on (the SDK's net/server), the frontends' file server (the SDK's net/static), and the process sampler of the runtime graph a serving app answers (the SDK's proc/process, and through it runtime/metrics and the spawn engine).

Package storeengine is what framework/app/store plugs into kit: the engines the framework's stores run on — the SDK's document store in memory, in the data directory and over SQL —, the framework's scope on a database — the SDK's transaction manager, its check and its migrator — and the migrations of the framework's tables (ADR 0179 §1).

Package studioengine is what framework/app/studio plugs into the framework (ADR 0179 §1, step 8; ADR 0180 §4, step 1): the Studio's routes, their guard and their handlers — the graph, the live events as a Server-Sent Events stream (the SDK's net/sse), traces, source, instances, items, and the dev tools with the profiler (the SDK's profiling) —, the tool's variables the framework dev and the Studio set, and the framework's sentences in the languages after English — the catalogues the Studio shows its reader's language from, compiled by the SDK's i18n (Q6).

Package workflowengine is what framework/app/workflow plugs into kit: the engine the framework's workflows run on — the SDK's statemachine, instantiated once, over the framework's entity and the state's spelling (ADR 0179 §1, step 5, Q3) —, its loop of timers and guards, and the conversions between the engine's values and plug's.

Package entitlement — the error-code range this domain owns (framework/connectors/ssh block).

Package gate — the dotted-quad code range this domain owns.

Package git — the error-code range owned by this domain (ADR 0005 §Registry).

Package selfupdate — the error-code range owned by this domain (ADR 0005 §Registry).

Package entitlement — the trust anchors this verifier accepts, and why there is more than one of them.

Package gate — the classifier behind framework/gate.

Package git — the changed set: which files, line ranges and directories a branch touched.

Package selfupdate replaces the running binary with a newer signed release.