diff --git a/docs/internal/runtime.md b/docs/internal/runtime.md
index f631fe9..97e2113 100644
--- a/docs/internal/runtime.md
+++ b/docs/internal/runtime.md
@@ -68,6 +68,21 @@ Runtime composition uses feedkit for:
 
 Weatherfeeder registers its own source drivers and its Postgres schema mapper.
 
+Responsibility split:
+
+| Runtime concern | Owner |
+| --- | --- |
+| Config loading and generic validation | feedkit |
+| Source, processor, and sink registries | feedkit mechanics; weatherfeeder registrations |
+| Source polling and stream supervision | feedkit scheduler |
+| Raw weather data fetching | weatherfeeder source adapters |
+| Normalizer execution order and pass-through behavior | feedkit normalize processor |
+| Weather raw-to-canonical mapping | weatherfeeder normalizers |
+| Dedupe mechanics | feedkit dedupe processor |
+| Route compilation and sink fanout | feedkit dispatch |
+| Weather Postgres table shape and row mapping | weatherfeeder Postgres adapter |
+| Postgres connection, DDL, inserts, transactions, and pruning | feedkit Postgres sink |
+
 ## State
 
 Weatherfeeder-owned runtime state is in process:
diff --git a/docs/policy/architecture.md b/docs/policy/architecture.md
index 67edf3c..a086b6d 100644
--- a/docs/policy/architecture.md
+++ b/docs/policy/architecture.md
@@ -23,6 +23,27 @@ The implemented runtime flow is:
 
 Canonical payload structs live in `model`. Schema identifiers and cross-provider wire conventions live in `standards`. Source adapters live under `internal/sources`. Normalizers live under `internal/normalizers`. Provider-specific parsing helpers shared by sources and normalizers live under `internal/providers`. Sink-specific persistence mapping lives under `internal/sinks`.
 
+## Architecture Style
+
+`weatherfeeder` uses a pragmatic ports-and-adapters architecture rather than a
+formal framework. Provider APIs, config loading, scheduling, dispatch, and sinks
+sit outside the weather domain model and normalization rules.
+
+The implementation style is:
+
+- Pipeline-oriented: events flow from source polling through normalization,
+  dedupe, routing, and sink fanout.
+- Schema-routed: normalizers select raw payloads by explicit schema strings, not
+  source names or configured routes.
+- Provider-isolated: NWS, Open-Meteo, OpenWeather, and SPC quirks stay in
+  provider-specific source, provider-helper, and normalizer packages.
+- Registry-based: built-in source drivers, normalizers, processors, and sinks
+  are assembled explicitly through registries instead of dynamic plugin loading.
+- Adapter-clean: persistence and external-system details stay behind source and
+  sink adapters, not in `model` or normalizers.
+- Direct Go: prefer small package-level constructors and straightforward code
+  over broad abstractions.
+
 ## Core Design Principles
 
 - Hexagonal boundaries: provider APIs, config loading, scheduling, dispatch, and sinks are external mechanisms around the weather domain model and normalization logic.
@@ -57,6 +78,23 @@ Tests and examples:
 - The sample `cmd/weatherfeeder/config.yml` is executable test input and is load-tested.
 - Tests should keep exercising package contracts directly rather than relying only on full-daemon execution.
 
+## Feedkit Boundary
+
+`feedkit` provides reusable daemon infrastructure. `weatherfeeder` provides the
+weather-domain adapters, models, schemas, and mapping policy.
+
+| Area | Feedkit owns | Weatherfeeder owns |
+| --- | --- | --- |
+| Config | Generic YAML shape: sources, sinks, routes, modes, cadence, and params. | Driver-specific config rules such as NWS `user_agent`, OpenWeather `units=metric`, and SPC coordinates. |
+| Events | Domain-agnostic event envelope: ID, kind, source, emitted/effective times, schema, and payload. | Event kind meaning, schema strings, and canonical weather payloads. |
+| Sources | Source interfaces, registry, expected-kind validation, HTTP helper, and default event ID helper. | NWS/Open-Meteo/OpenWeather/SPC source drivers and raw schema emission. |
+| Processing | Processor registry, normalize processor, dedupe processor, and pipeline execution. | Weather normalizers and schema-specific raw-to-canonical mapping. |
+| Dispatch | Route compilation and sink fanout mechanics. | Which weather event kinds are configured and meaningful. |
+| Sinks | Generic stdout, NATS, and Postgres sink mechanics. | Weather-specific Postgres schema and canonical event-to-row mapping. |
+
+Do not move weather-domain policy into `feedkit`, and do not duplicate generic
+daemon mechanics in `weatherfeeder` when feedkit already provides the boundary.
+
 ## Modules Or Processing Steps
 
 The implemented processing steps are source polling, normalization, dedupe, and sink dispatch.
diff --git a/docs/policy/development.md b/docs/policy/development.md
index 7af25d3..bfddd84 100644
--- a/docs/policy/development.md
+++ b/docs/policy/development.md
@@ -70,6 +70,32 @@ Use fixtures, local test servers, and package-level tests.
 - Prefer explicit registries and small package-level constructors over hidden
   global behavior.
 
+## Architecture-Preserving Changes
+
+When changing `weatherfeeder`, preserve the split between feedkit
+infrastructure and weather-domain behavior.
+
+Do:
+
+- keep generic scheduling, dispatch, processor, config, and sink mechanics in
+  feedkit;
+- keep weather provider rules in source adapters, provider helpers, and
+  normalizers;
+- keep canonical weather payloads in `model` and schema/wire identifiers in
+  `standards`;
+- keep Postgres table and row mapping under `internal/sinks/postgres`;
+- use explicit registries for built-in sources and normalizers.
+
+Do not:
+
+- move provider parsing, WMO mapping, or canonical weather policy into
+  `cmd/weatherfeeder`;
+- move weather-specific constants, schemas, or validation rules into feedkit;
+- put database column metadata or sink-specific tags on canonical model structs;
+- replace explicit registries with dynamic plugin loading;
+- introduce broad abstractions when a small provider-specific helper preserves
+  clarity.
+
 ## Dependency Policy
 
 Prefer the Go standard library unless a dependency materially improves