refactor(infra): split de drivers pesados a subpaquetes + fix TestSSEHandler

Mueve duckdb_open, clickhouse_open, postgres_open, matrix_* y keyring_token_store
del paquete monolitico functions/infra a subpaquetes propios
(functions/infra/{duckdb,clickhouse,postgres,matrix,keyring}). El paquete infra ya
no importa los drivers (go-duckdb, clickhouse-go, pgx, mautrix, go-keyring), por lo
que las apps que solo usan funciones ligeras (process, cron, http, sqlite) dejan de
arrastrarlos. Reduccion de binarios: dag_engine 72->10MB, registry_api 70->8.7MB,
services_api 70->9MB, call_monitor 68->6.6MB, sqlite_api 70->8.9MB.

Los IDs del registry se mantienen estables (domain: infra en frontmatter). Se
preservan los build tags goolm/libolm de matrix_crypto_init.

Tambien corrige TestSSEHandler: el test leia el body con un unico Read() que con
HTTP chunked solo capturaba el primer evento; ahora usa io.ReadAll hasta EOF.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

functions/infra/clickhouse/clickhouse_open.go

@@ -1,6 +1,4 @@
-//go:build !noclickhouse
-
-package infra
+package clickhouse
 
 import (
 	"database/sql"

functions/infra/clickhouse/clickhouse_open.md

@@ -29,7 +29,7 @@ output: "conexion sql.DB abierta a ClickHouse con ping verificado"
 tested: false
 tests: []
 test_file_path: ""
-file_path: "functions/infra/clickhouse_open.go"
+file_path: "functions/infra/clickhouse/clickhouse_open.go"
 ---
 
 ## Ejemplo

functions/infra/duckdb/duckdb_open.go

@@ -1,6 +1,4 @@
-//go:build !noduckdb
-
-package infra
+package duckdb
 
 import (
 	"database/sql"

functions/infra/duckdb/duckdb_open.md

@@ -21,7 +21,7 @@ output: "conexion sql.DB abierta a DuckDB"
 tested: false
 tests: []
 test_file_path: ""
-file_path: "functions/infra/duckdb_open.go"
+file_path: "functions/infra/duckdb/duckdb_open.go"
 ---
 
 ## Ejemplo

functions/infra/keyring/keyring_token_store.go

@@ -1,4 +1,4 @@
-package infra
+package keyring
 
 import (
 	"encoding/json"

functions/infra/keyring/keyring_token_store.md

@@ -54,8 +54,8 @@ tests:
   - "Save then Delete then Load returns ErrNotFound"
   - "Delete nonexistent is idempotent"
   - "Save twice overwrites with second token"
-test_file_path: "functions/infra/keyring_token_store_test.go"
-file_path: "functions/infra/keyring_token_store.go"
+test_file_path: "functions/infra/keyring/keyring_token_store_test.go"
+file_path: "functions/infra/keyring/keyring_token_store.go"
 ---
 
 ## Ejemplo

functions/infra/keyring/keyring_token_store_test.go

@@ -1,4 +1,4 @@
-package infra
+package keyring
 
 import (
 	"errors"

functions/infra/matrix/matrix_client_init.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_client_init.md

@@ -38,8 +38,8 @@ tests:
   - "Whoami 401 token invalido"
   - "EnableCrypto true devuelve error not implemented"
   - "StoreDir se crea con permisos 0700"
-test_file_path: "functions/infra/matrix_client_init_test.go"
-file_path: "functions/infra/matrix_client_init.go"
+test_file_path: "functions/infra/matrix/matrix_client_init_test.go"
+file_path: "functions/infra/matrix/matrix_client_init.go"
 ---
 
 ## Ejemplo

functions/infra/matrix/matrix_client_init_test.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"encoding/json"

functions/infra/matrix/matrix_crypto_init.go

@@ -1,6 +1,6 @@
 //go:build goolm || libolm
 
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_crypto_init.md

@@ -38,8 +38,8 @@ tests:
   - "directorio del store se crea con permisos 0700"
   - "input valido Init exito helper no nil"
   - "Synapse 401 en keys upload devuelve error"
-test_file_path: "functions/infra/matrix_crypto_init_test.go"
-file_path: "functions/infra/matrix_crypto_init.go"
+test_file_path: "functions/infra/matrix/matrix_crypto_init_test.go"
+file_path: "functions/infra/matrix/matrix_crypto_init.go"
 ---
 
 ## Ejemplo

functions/infra/matrix/matrix_crypto_init_test.go

@@ -1,6 +1,6 @@
 //go:build goolm || libolm
 
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_message_send.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"bytes"

functions/infra/matrix/matrix_message_send.md

@@ -53,8 +53,8 @@ tests:
   - "SendReply client nil devuelve error"
   - "EditMessage client nil devuelve error"
   - "SendReaction client nil devuelve error"
-test_file_path: "functions/infra/matrix_message_send_test.go"
-file_path: "functions/infra/matrix_message_send.go"
+test_file_path: "functions/infra/matrix/matrix_message_send_test.go"
+file_path: "functions/infra/matrix/matrix_message_send.go"
 ---
 
 ## Ejemplo

functions/infra/matrix/matrix_message_send_test.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_room_list.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_room_list.md

@@ -30,8 +30,8 @@ tests:
   - "IsDirect set correctamente segun m.direct"
   - "IsEncrypted set segun presencia de m.room.encryption"
   - "client nil devuelve error"
-test_file_path: "functions/infra/matrix_room_list_test.go"
-file_path: "functions/infra/matrix_room_list.go"
+test_file_path: "functions/infra/matrix/matrix_room_list_test.go"
+file_path: "functions/infra/matrix/matrix_room_list.go"
 ---
 
 ## Ejemplo

functions/infra/matrix/matrix_room_list_test.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_sync_service.go

@@ -1,4 +1,4 @@
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/matrix/matrix_sync_service.md

@@ -36,8 +36,8 @@ tests:
   - "Error401NoExit"
   - "StopIdempotente"
   - "CtxCancelCierraChannels"
-test_file_path: "functions/infra/matrix_sync_service_test.go"
-file_path: "functions/infra/matrix_sync_service.go"
+test_file_path: "functions/infra/matrix/matrix_sync_service_test.go"
+file_path: "functions/infra/matrix/matrix_sync_service.go"
 ---
 
 ## Ejemplo

functions/infra/matrix/matrix_sync_service_test.go

@@ -1,6 +1,6 @@
 //go:build goolm
 
-package infra
+package matrix
 
 import (
 	"context"

functions/infra/postgres/postgres_open.go

@@ -1,4 +1,4 @@
-package infra
+package postgres
 
 import (
 	"database/sql"

functions/infra/postgres/postgres_open.md

@@ -31,7 +31,7 @@ output: "conexion sql.DB abierta a PostgreSQL"
 tested: false
 tests: []
 test_file_path: ""
-file_path: "functions/infra/postgres_open.go"
+file_path: "functions/infra/postgres/postgres_open.go"
 ---
 
 ## Ejemplo

functions/infra/sse_test.go

@@ -2,6 +2,7 @@ package infra
 
 import (
 	"context"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"strings"
@@ -210,9 +211,16 @@ func TestSSEHandler(t *testing.T) {
 		}
 		defer resp.Body.Close()
 
-		buf := make([]byte, 4096)
-		n, _ := resp.Body.Read(buf)
-		body := string(buf[:n])
+		// Leer el body completo hasta EOF. El canal se cierra antes de la
+		// peticion, asi que el handler envia ambos eventos y termina, cerrando
+		// el stream. Un unico Read podria devolver solo el primer chunk
+		// (event: first), porque io.Reader.Read no garantiza llenar el buffer;
+		// io.ReadAll consume todos los chunks emitidos por el handler.
+		raw, err := io.ReadAll(resp.Body)
+		if err != nil {
+			t.Fatalf("read body failed: %v", err)
+		}
+		body := string(raw)
 
 		for _, want := range []string{"event: first", "event: second", "data: 1", "data: 2"} {
 			if !strings.Contains(body, want) {