feat: implement memory management system with SQLite persistence, including conversation windows and episodic facts

internal/config/schema.go

@@ -17,6 +17,7 @@ type AgentConfig struct {
 	Observability ObservabilityCfg `yaml:"observability"`
 	Resilience  ResilienceCfg  `yaml:"resilience"`
 	Storage     StorageCfg     `yaml:"storage"`
+	Memory      MemoryCfg      `yaml:"memory"`
 }
 
 // ── Identity ──────────────────────────────────────────────────────────────
@@ -107,6 +108,7 @@ type ToolsCfg struct {
 	Scripts  ScriptsCfg      `yaml:"scripts"`
 	FileOps  FileOpsCfg      `yaml:"file_ops"`
 	MCP      MCPToolCfg      `yaml:"mcp"`
+	Memory   MemoryToolCfg   `yaml:"memory"`
 }
 
 type SSHToolCfg struct {
@@ -384,3 +386,15 @@ type HistoryStorageCfg struct {
 	Path      string        `yaml:"path"`
 	Retention time.Duration `yaml:"retention"`
 }
+
+// ── Memory ────────────────────────────────────────────────────────────────
+
+type MemoryCfg struct {
+	Enabled    bool   `yaml:"enabled"`
+	WindowSize int    `yaml:"window_size"` // sliding window size per room (default 20)
+	DBPath     string `yaml:"db_path"`     // SQLite path (default agents/<id>/data/memory.db)
+}
+
+type MemoryToolCfg struct {
+	Enabled bool `yaml:"enabled"`
+}