feat: add self-evolution plugin — agent self-optimization system

Add a comprehensive self-evolution system that enables Hermes Agent
to continuously improve through automated analysis and optimization:

Core components:
- reflection_engine: Nightly session analysis (1:00 AM)
- evolution_proposer: Generate improvement proposals from insights
- quality_scorer: Multi-dimensional session quality evaluation
- strategy_injector: Inject learned strategies into new sessions
- strategy_compressor: Strategy optimization and deduplication
- git_analyzer: Code change pattern analysis
- rule_engine: Pattern-based rule generation
- feishu_notifier: Feishu card notifications for evolution events

Storage:
- db.py: SQLite telemetry storage
- strategy_store: Persistent strategy storage
- models.py: Data models

Plugin integration:
- plugin.yaml, hooks.py, __init__.py for plugin system
- cron_jobs.py for scheduled tasks

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

self_evolution/strategy_store.py

@@ -0,0 +1,72 @@
+"""
+Self Evolution Plugin — Strategy Store
+========================================
+
+Manages strategy rules with version history and rollback support.
+
+Strategies stored at ~/.hermes/self_evolution/strategies.json
+Archives at ~/.hermes/self_evolution/archive/strategies_v{N}.json
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+from pathlib import Path
+from typing import Any, Dict, Optional
+
+logger = logging.getLogger(__name__)
+
+from self_evolution.paths import DATA_DIR as STRATEGIES_DIR, STRATEGIES_FILE, ARCHIVE_DIR
+
+
+class StrategyStore:
+    """Load, save, and version strategy rules."""
+
+    def load(self) -> dict:
+        """Load current strategies."""
+        if not STRATEGIES_FILE.exists():
+            return {"version": 0, "rules": []}
+        try:
+            return json.loads(STRATEGIES_FILE.read_text(encoding="utf-8"))
+        except (json.JSONDecodeError, OSError):
+            return {"version": 0, "rules": []}
+
+    def save(self, data: dict):
+        """Save strategies to file."""
+        STRATEGIES_DIR.mkdir(parents=True, exist_ok=True)
+        STRATEGIES_FILE.write_text(
+            json.dumps(data, ensure_ascii=False, indent=2),
+            encoding="utf-8",
+        )
+
+    def archive(self, version: int):
+        """Archive current strategies for rollback."""
+        if not STRATEGIES_FILE.exists():
+            return
+        ARCHIVE_DIR.mkdir(parents=True, exist_ok=True)
+        archive_path = ARCHIVE_DIR / f"strategies_v{version}.json"
+        archive_path.write_text(
+            STRATEGIES_FILE.read_text(encoding="utf-8"),
+            encoding="utf-8",
+        )
+        logger.info("Archived strategies version %d", version)
+
+    def load_archive(self, version: int) -> Optional[dict]:
+        """Load an archived version."""
+        archive_path = ARCHIVE_DIR / f"strategies_v{version}.json"
+        if not archive_path.exists():
+            return None
+        try:
+            return json.loads(archive_path.read_text(encoding="utf-8"))
+        except (json.JSONDecodeError, OSError):
+            return None
+
+    def restore(self, data: dict):
+        """Restore strategies from an archive."""
+        self.save(data)
+        logger.info("Restored strategies from archive")
+
+    def get_version(self) -> int:
+        """Get current version number."""
+        return self.load().get("version", 0)