M11b-2a: resolve root-package spec compliance (drop repo-root __init__.py forwarding package)

QC #3: modules/world_sync/__init__.py made the module REPO ROOT a Python package,
violating module-development-spec (mymodule/ = repo root, mymodule/mymodule/ = package).
Host wiring verified to resolve to the INNER package, so the root forwarding table is
dead weight:
  - apps/scense/app/scense.py:50  from world_sync.init import load_world_sync
  - apps/yuanjing/app/yuanjing.py:66  __import__(f'{module}.init', ...)
Both parse world_sync/init.py with sys.path=<repo root>; neither uses the root package.

Re-verified after deletion: py_compile OK for all .py; import closure 0-broken from both
sys.path=modules/ and sys.path=modules/world_sync/ (import world_sync /
from world_sync.init import load_world_sync / 4 contract APIs; __all__ len=62 MISSING=[]).
pyproject packages.find needs no tightening: with the root package gone,
where=['.'] include=['world_sync*'] discovers exactly one package.

Unrelated pre-existing WIP scripts/validate_models_json.py (M11b-2b-A) intentionally
excluded from this commit via pathspec.

__init__.py

@@ -1,156 +0,0 @@
-# -*- coding: utf-8 -*-
-"""world_sync 模块仓库根包（对外统一导出面，纯转发，无第二份实现）。
-
-三层接线（M11b-2a 收口，响应 QC #2/#3）
-======================================
-- ``world_sync.world_sync.init``：**① 实现 + ③ env 注册** ——
-  ``load_world_sync(server_env=None, conn_factory=None)`` 与 ``env.xxx = xxx`` 登记；
-- ``world_sync.world_sync.__init__``：**② 导出** —— ``from .init import load_world_sync, ...``；
-- 本文件（仓库根包）：把内层包的能力原样转发到模块级 API，**不再自带任何 ``load_world_sync``
-  定义**，使「实现 / 导出 / env 注册」三处指向同一真源。
-
-两种加载路径都可用（取决于 sys.path 落点）：
-``import world_sync; world_sync.load_world_sync()``（sys.path 含 ``modules/``）
-与 ``from world_sync import load_world_sync``（pip install -e 本仓库，包目录即 ``world_sync/``）。
-
-铁律：本包不硬编码库名（取库名走 ``ServerEnv().get_module_dbname('world_sync')``），
-不在导入期建立任何数据库连接（连接工厂缺失时由写入调用点 fail-closed 抛异常）。
-"""
-
-from .world_sync import (
-    # 挂载入口（唯一实现位于 world_sync/init.py）
-    load_world_sync,
-    # 模块元信息
-    MODULE_NAME,
-    MODULE_VERSION,
-    MODULE_TABLES,
-    SERVER_ENV_CONN_FACTORY_KEYS,
-    SERVER_ENV_KEYS,
-    # 既有 CRUD
-    list_world_syncs,
-    get_world_sync,
-    create_world_sync,
-    update_world_sync,
-    delete_world_sync,
-    execute_world_sync,
-    # M11b-1 表注册（只读元数据）
-    module_tables,
-    get_table_schema,
-    load_table_model,
-    pbl_runtime_event_schema,
-    pbl_runtime_event_partitions,
-    # M11b-2 写入 / 读取契约
-    write_event_with_state,
-    read_entity_state,
-    configure_runtime_writer,
-    get_runtime_writer,
-    build_runtime_write_plan,
-    runtime_write_percentile,
-    runtime_write_dialect_name,
-    runtime_write_ddl,
-    # 工厂 / 方言 / 常量
-    resolve_conn_factory,
-    build_sqlite_conn_factory,
-    build_mysql_conn_factory,
-    build_conn_factory_from_pools,
-    host_conn_factory,
-    load_db_config,
-    module_conf_dir,
-    detect_dialect,
-    ddl_for,
-    percentile,
-    EVENT_TABLE,
-    STATE_TABLE,
-    DIALECT_MYSQL,
-    DIALECT_SQLITE,
-    DEFAULT_EVENT_TYPE,
-    DEFAULT_SOURCE,
-    EVENT_REQUIRED,
-    STATE_KEY_COLUMNS,
-    POOL_KEYS,
-    ENV_NAME_KEYS,
-    new_event_id,
-    new_event_uid,
-    utc_now_text,
-    # 异常族（fail-closed，含 M11b-2a 语义别名）
-    PblRuntimeError,
-    TxConfigError,
-    ConnFactoryNotConfigured,
-    EventWriteError,
-    StateWriteError,
-    ConcurrentStateConflict,
-    TxAbortError,
-    RuntimeWriteError,
-    InvalidWriteRequest,
-    ConnectionUnavailable,
-    TransactionAborted,
-    # 宿主基础包可用性（自检用）
-    HOST_DEPS_AVAILABLE,
-    HOST_DEPS_ERROR,
-    HostDepsNotAvailable,
-)
-
-__all__ = [
-    "load_world_sync",
-    "MODULE_NAME",
-    "MODULE_VERSION",
-    "MODULE_TABLES",
-    "SERVER_ENV_CONN_FACTORY_KEYS",
-    "SERVER_ENV_KEYS",
-    "list_world_syncs",
-    "get_world_sync",
-    "create_world_sync",
-    "update_world_sync",
-    "delete_world_sync",
-    "execute_world_sync",
-    "module_tables",
-    "get_table_schema",
-    "load_table_model",
-    "pbl_runtime_event_schema",
-    "pbl_runtime_event_partitions",
-    "write_event_with_state",
-    "read_entity_state",
-    "configure_runtime_writer",
-    "get_runtime_writer",
-    "build_runtime_write_plan",
-    "runtime_write_percentile",
-    "runtime_write_dialect_name",
-    "runtime_write_ddl",
-    "resolve_conn_factory",
-    "build_sqlite_conn_factory",
-    "build_mysql_conn_factory",
-    "build_conn_factory_from_pools",
-    "host_conn_factory",
-    "load_db_config",
-    "module_conf_dir",
-    "detect_dialect",
-    "ddl_for",
-    "percentile",
-    "EVENT_TABLE",
-    "STATE_TABLE",
-    "DIALECT_MYSQL",
-    "DIALECT_SQLITE",
-    "DEFAULT_EVENT_TYPE",
-    "DEFAULT_SOURCE",
-    "EVENT_REQUIRED",
-    "STATE_KEY_COLUMNS",
-    "POOL_KEYS",
-    "ENV_NAME_KEYS",
-    "new_event_id",
-    "new_event_uid",
-    "utc_now_text",
-    "PblRuntimeError",
-    "TxConfigError",
-    "ConnFactoryNotConfigured",
-    "EventWriteError",
-    "StateWriteError",
-    "ConcurrentStateConflict",
-    "TxAbortError",
-    "RuntimeWriteError",
-    "InvalidWriteRequest",
-    "ConnectionUnavailable",
-    "TransactionAborted",
-    "HOST_DEPS_AVAILABLE",
-    "HOST_DEPS_ERROR",
-    "HostDepsNotAvailable",
-]