iggy

Write tests for Apache Iggy connectors - sinks, sources, transforms, SDK, runtime. Covers BDD unit-test naming, the canonical source state round-trip tests, and the real-infra integration test layout under `core/integration/tests/connectors/` with `testcontainers-modules` + `#[iggy_harness]`. Load when writing or reviewing tests in `core/connectors/` or `core/integration/tests/connectors/`. Use for connector test authoring. NOT for runtime internals or non-connector test patterns.

Modify the Apache Iggy Connectors runtime (`core/connectors/runtime/`) - the host process that loads plugins, manages lifecycle, and bridges Apache Iggy streams to plugins via FFI. Use when changing plugin loading, the FFI dispatch, the sink/source manager, state storage, config providers, the HTTP control API, metrics, or transforms wiring. NOT for plugin code.

Extend or modify the Apache Iggy Connectors SDK (`core/connectors/sdk/`). Use when adding a new `Schema` variant, a new `StreamDecoder`/`StreamEncoder`, a new `Error` variant, modifying the `Sink`/`Source`/`Transform` trait surface, the FFI macros, or the `retry`/`api`/`convert` modules. NOT for writing plugins - use `connector-sink` or `connector-source` for those.

Author a new Apache Iggy connector sink plugin under core/connectors/sinks/. Sinks consume messages from Apache Iggy streams and push them to an external system (DB, search engine, HTTP endpoint, object store). Load when creating, modifying, or reviewing a sink crate. Use for sink plugin authoring. NOT for runtime internals (see connector-runtime).

Author a new Apache Iggy connector source plugin under core/connectors/sources/. Sources poll an external system (DB, API, queue) and produce messages into Apache Iggy streams. Load when creating, modifying, or reviewing a source crate. Use for source plugin authoring. NOT for runtime internals (see connector-runtime).

Add a new transform under `core/connectors/sdk/src/transforms/`. Transforms mutate, filter, or convert messages between source/encode and decode/sink. Use when adding field-level transforms (add/delete/update/filter), format conversions, envelope unwrapping, or similar config-driven message manipulations for Apache Iggy connectors. Use for transform authoring. NOT for runtime internals or sink/source loops.

Entry point and index for the Apache Iggy Connectors subsystem (`core/connectors/`). Load this first when working anywhere under `core/connectors/` - runtime, SDK, sinks, sources, or transforms. Routes to the focused per-area skills.