Refactor feedkit boundaries ahead of v1

Remove global Postgres schema registration in favor of explicit schema-aware sink factory wiring, and update weatherfeeder to register the Postgres sink explicitly. Add optional per-source HTTP timeout and response body limit overrides while keeping feedkit defaults. Remove remaining legacy source/config compatibility surfaces, including singular kind support and old source registry/type aliases, and migrate weatherfeeder sources to plural `Kinds()` metadata. Clean up related docs, tests, and sample config to match the new Postgres, HTTP, and NATS configuration model.

sources/http.go

@@ -19,13 +19,14 @@ import (
 // setup, and conditional GET validator handling. Concrete daemon sources remain
 // responsible for decoding the response body and constructing events.
 type HTTPSource struct {
-	Driver      string
-	Name        string
-	URL         string
-	UserAgent   string
-	Accept      string
-	Conditional bool
-	Client      *http.Client
+	Driver                 string
+	Name                   string
+	URL                    string
+	UserAgent              string
+	Accept                 string
+	Conditional            bool
+	ResponseBodyLimitBytes int64
+	Client                 *http.Client
 
 	mu         sync.Mutex
 	validators transport.HTTPValidators
@@ -68,14 +69,33 @@ func NewHTTPSource(driver string, cfg config.SourceConfig, accept string) (*HTTP
 		}
 	}
 
+	timeout := transport.DefaultHTTPTimeout
+	if _, exists := cfg.Params["http_timeout"]; exists {
+		var ok bool
+		timeout, ok = cfg.ParamDuration("http_timeout")
+		if !ok || timeout <= 0 {
+			return nil, fmt.Errorf("source %q: params.http_timeout must be a positive duration", cfg.Name)
+		}
+	}
+
+	bodyLimit := transport.DefaultHTTPResponseBodyLimitBytes
+	if _, exists := cfg.Params["http_response_body_limit_bytes"]; exists {
+		rawLimit, ok := cfg.ParamInt("http_response_body_limit_bytes")
+		if !ok || rawLimit <= 0 {
+			return nil, fmt.Errorf("source %q: params.http_response_body_limit_bytes must be a positive integer", cfg.Name)
+		}
+		bodyLimit = int64(rawLimit)
+	}
+
 	return &HTTPSource{
-		Driver:      driver,
-		Name:        name,
-		URL:         url,
-		UserAgent:   userAgent,
-		Accept:      accept,
-		Conditional: conditional,
-		Client:      transport.NewHTTPClient(transport.DefaultHTTPTimeout),
+		Driver:                 driver,
+		Name:                   name,
+		URL:                    url,
+		UserAgent:              userAgent,
+		Accept:                 accept,
+		Conditional:            conditional,
+		ResponseBodyLimitBytes: bodyLimit,
+		Client:                 transport.NewHTTPClient(timeout),
 	}, nil
 }
 
@@ -92,7 +112,12 @@ func (s *HTTPSource) FetchBytesIfChanged(ctx context.Context) ([]byte, bool, err
 	validators := s.validators
 	s.mu.Unlock()
 
-	body, changed, next, err := transport.FetchBodyIfChanged(
+	bodyLimit := s.ResponseBodyLimitBytes
+	if bodyLimit <= 0 {
+		bodyLimit = transport.DefaultHTTPResponseBodyLimitBytes
+	}
+
+	body, changed, next, err := transport.FetchBodyIfChangedWithLimit(
 		ctx,
 		client,
 		s.URL,
@@ -100,6 +125,7 @@ func (s *HTTPSource) FetchBytesIfChanged(ctx context.Context) ([]byte, bool, err
 		s.Accept,
 		s.Conditional,
 		validators,
+		bodyLimit,
 	)
 	if err != nil {
 		return nil, false, fmt.Errorf("%s %q: %w", s.Driver, s.Name, err)