fix: StructuredLogger.info()をlog_info()に修正

StructuredLogger.info()がlog_debug()を呼び出していたため、
テストのcaplogでログがキャプチャされない問題を修正。
info()メソッドは論理的にINFOレベルで出力するべきなので、
log_info()を使用するように変更。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: web-flow

EpisodicRAG/docs/user/QUICKSTART.en.md

@@ -86,14 +86,14 @@ Created files:
 
 Create a file with the following content:
 
-**Filename**: `Loop0001_TestConversation.txt`
+**Filename**: `L00001_TestConversation.txt`
 
 **Location**: `~/.claude/plugins/EpisodicRAG-Plugin@Plugins-Weave/data/Loops/`
 
 **Content** (copy-paste ready):
 
 ```text
-# Loop0001: Test Conversation
+# L00001: Test Conversation
 
 User: Hello, this is a test for EpisodicRAG.
 Assistant: Hello! This is a test for EpisodicRAG. How can I help you?
@@ -114,7 +114,7 @@ Assistant: EpisodicRAG is an 8-layer long-term memory system. It saves conversat
 ```text
 Unprocessed Loop files detected: 1
 
-  - Loop0001_TestConversation.txt
+  - L00001_TestConversation.txt
 
 Starting analysis with DigestAnalyzer...
 

EpisodicRAG/scripts/infrastructure/structured_logging.py

@@ -23,7 +23,7 @@
     LOG_PREFIX_STATE,
     LOG_PREFIX_VALIDATE,
 )
-from infrastructure.logging_config import log_debug
+from infrastructure.logging_config import log_debug, log_info
 
 
 class StructuredLoggerProtocol(Protocol):
@@ -111,9 +111,9 @@ def info(self, message: str) -> None:
 
         Example:
             logger.info("Processing started")
-            # -> [DEBUG] Processing started
+            # -> [INFO] Processing started
         """
-        log_debug(message)
+        log_info(message)
 
     def state(self, message: str, **context: Any) -> None:
         """

EpisodicRAG/scripts/test/config_tests/test_error_messages.py

@@ -0,0 +1,306 @@
+#!/usr/bin/env python3
+"""
+error_messages ユニットテスト
+=============================
+
+config/error_messages.py のユニットテスト。
+各エラーメッセージ生成関数の動作を検証:
+- invalid_level_message
+- unknown_level_message
+- config_key_missing_message
+- config_invalid_value_message
+- config_section_missing_message
+- initialization_failed_message
+- file_not_found_message
+- invalid_json_message
+- directory_not_found_message
+"""
+
+from pathlib import Path
+
+import pytest
+
+from config.error_messages import (
+    config_invalid_value_message,
+    config_key_missing_message,
+    config_section_missing_message,
+    directory_not_found_message,
+    file_not_found_message,
+    initialization_failed_message,
+    invalid_json_message,
+    invalid_level_message,
+    unknown_level_message,
+)
+
+
+# =============================================================================
+# TestInvalidLevelMessage
+# =============================================================================
+
+
+class TestInvalidLevelMessage:
+    """invalid_level_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_without_valid_levels(self):
+        """有効レベルなしのメッセージ"""
+        result = invalid_level_message("invalid_level")
+        assert result == "Invalid level: 'invalid_level'"
+
+    @pytest.mark.unit
+    def test_with_valid_levels(self):
+        """有効レベルありのメッセージ"""
+        valid = ["weekly", "monthly", "annual"]
+        result = invalid_level_message("bad", valid)
+        assert "Invalid level: 'bad'" in result
+        assert "weekly" in result
+        assert "monthly" in result
+        assert "annual" in result
+
+    @pytest.mark.unit
+    def test_with_single_valid_level(self):
+        """単一の有効レベル"""
+        result = invalid_level_message("bad", ["weekly"])
+        assert "Invalid level: 'bad'" in result
+        assert "weekly" in result
+
+    @pytest.mark.unit
+    def test_with_empty_valid_levels(self):
+        """空の有効レベルリスト"""
+        result = invalid_level_message("bad", [])
+        # 空リストはFalsyなので、valid_levelsなしと同じ扱い
+        assert result == "Invalid level: 'bad'"
+
+    @pytest.mark.unit
+    def test_with_none_valid_levels(self):
+        """None の有効レベル"""
+        result = invalid_level_message("bad", None)
+        assert result == "Invalid level: 'bad'"
+
+    @pytest.mark.unit
+    def test_special_characters_in_level(self):
+        """特殊文字を含むレベル名"""
+        result = invalid_level_message("level<script>")
+        assert "level<script>" in result
+
+
+# =============================================================================
+# TestUnknownLevelMessage
+# =============================================================================
+
+
+class TestUnknownLevelMessage:
+    """unknown_level_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_basic_message(self):
+        """基本的なメッセージ"""
+        result = unknown_level_message("unknown")
+        assert result == "Unknown level: 'unknown'"
+
+    @pytest.mark.unit
+    def test_empty_level(self):
+        """空のレベル名"""
+        result = unknown_level_message("")
+        assert result == "Unknown level: ''"
+
+    @pytest.mark.unit
+    def test_level_with_spaces(self):
+        """スペースを含むレベル名"""
+        result = unknown_level_message("weekly level")
+        assert "weekly level" in result
+
+
+# =============================================================================
+# TestConfigKeyMissingMessage
+# =============================================================================
+
+
+class TestConfigKeyMissingMessage:
+    """config_key_missing_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_basic_message(self):
+        """基本的なメッセージ"""
+        result = config_key_missing_message("loops_path")
+        assert result == "Required configuration key missing: 'loops_path'"
+
+    @pytest.mark.unit
+    def test_nested_key(self):
+        """ネストされたキー名"""
+        result = config_key_missing_message("paths.loops_dir")
+        assert "paths.loops_dir" in result
+
+
+# =============================================================================
+# TestConfigInvalidValueMessage
+# =============================================================================
+
+
+class TestConfigInvalidValueMessage:
+    """config_invalid_value_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_with_string_value(self):
+        """文字列値の場合"""
+        result = config_invalid_value_message("threshold", "int", "five")
+        assert "threshold" in result
+        assert "expected int" in result
+        assert "str" in result
+
+    @pytest.mark.unit
+    def test_with_int_value(self):
+        """整数値の場合"""
+        result = config_invalid_value_message("path", "str", 123)
+        assert "path" in result
+        assert "expected str" in result
+        assert "int" in result
+
+    @pytest.mark.unit
+    def test_with_list_value(self):
+        """リスト値の場合"""
+        result = config_invalid_value_message("count", "int", [1, 2, 3])
+        assert "count" in result
+        assert "list" in result
+
+    @pytest.mark.unit
+    def test_with_none_value(self):
+        """None値の場合"""
+        result = config_invalid_value_message("required", "str", None)
+        assert "required" in result
+        assert "NoneType" in result
+
+
+# =============================================================================
+# TestConfigSectionMissingMessage
+# =============================================================================
+
+
+class TestConfigSectionMissingMessage:
+    """config_section_missing_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_basic_message(self):
+        """基本的なメッセージ"""
+        result = config_section_missing_message("paths")
+        assert result == "'paths' section missing in config.json"
+
+    @pytest.mark.unit
+    def test_levels_section(self):
+        """levelsセクション"""
+        result = config_section_missing_message("levels")
+        assert "'levels' section missing" in result
+
+
+# =============================================================================
+# TestInitializationFailedMessage
+# =============================================================================
+
+
+class TestInitializationFailedMessage:
+    """initialization_failed_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_with_value_error(self):
+        """ValueError の場合"""
+        error = ValueError("invalid value")
+        result = initialization_failed_message("ConfigLoader", error)
+        assert "Failed to initialize ConfigLoader" in result
+        assert "invalid value" in result
+
+    @pytest.mark.unit
+    def test_with_file_not_found_error(self):
+        """FileNotFoundError の場合"""
+        error = FileNotFoundError("config.json not found")
+        result = initialization_failed_message("DigestConfig", error)
+        assert "Failed to initialize DigestConfig" in result
+        assert "config.json not found" in result
+
+    @pytest.mark.unit
+    def test_with_generic_exception(self):
+        """一般的なException"""
+        error = Exception("unknown error")
+        result = initialization_failed_message("Component", error)
+        assert "Failed to initialize Component" in result
+
+
+# =============================================================================
+# TestFileNotFoundMessage
+# =============================================================================
+
+
+class TestFileNotFoundMessage:
+    """file_not_found_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_with_path_object(self):
+        """Pathオブジェクトの場合"""
+        path = Path("/tmp/missing.json")
+        result = file_not_found_message(path)
+        assert "File not found:" in result
+        assert "missing.json" in result
+
+    @pytest.mark.unit
+    def test_with_relative_path(self):
+        """相対パスの場合"""
+        path = Path("config/config.json")
+        result = file_not_found_message(path)
+        assert "config.json" in result
+
+    @pytest.mark.unit
+    def test_with_windows_path(self):
+        """Windowsパスの場合"""
+        path = Path("C:/Users/test/file.json")
+        result = file_not_found_message(path)
+        assert "file.json" in result
+
+
+# =============================================================================
+# TestInvalidJsonMessage
+# =============================================================================
+
+
+class TestInvalidJsonMessage:
+    """invalid_json_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_with_decode_error(self):
+        """デコードエラーの場合"""
+        path = Path("/tmp/bad.json")
+        error = ValueError("Expecting property name enclosed in double quotes")
+        result = invalid_json_message(path, error)
+        assert "Invalid JSON" in result
+        assert "bad.json" in result
+        assert "double quotes" in result
+
+    @pytest.mark.unit
+    def test_path_included_in_message(self):
+        """パスがメッセージに含まれる"""
+        path = Path("/data/config.json")
+        error = Exception("parse error")
+        result = invalid_json_message(path, error)
+        assert "config.json" in result
+
+
+# =============================================================================
+# TestDirectoryNotFoundMessage
+# =============================================================================
+
+
+class TestDirectoryNotFoundMessage:
+    """directory_not_found_messageのテスト"""
+
+    @pytest.mark.unit
+    def test_basic_message(self):
+        """基本的なメッセージ"""
+        path = Path("/tmp/missing_dir")
+        result = directory_not_found_message(path)
+        assert "Directory not found:" in result
+        assert "missing_dir" in result
+
+    @pytest.mark.unit
+    def test_with_nested_path(self):
+        """ネストされたパス"""
+        path = Path("/data/Digests/1_Weekly")
+        result = directory_not_found_message(path)
+        assert "1_Weekly" in result