feat: add libSQL/Turso database backend with full feature parity

Introduce a Database trait abstraction (~60 async methods) enabling
compile-time backend selection between PostgreSQL and libSQL/Turso.
Convert all modules from concrete Store to Arc<dyn Database>, add
LibSqlSecretsStore and LibSqlWasmToolStore implementations, wire
libsql stores throughout CLI and main entry points, and make the
setup wizard backend-agnostic.

Key changes:
- src/db/: Database trait, PostgresDatabase adapter, LibSqlBackend
  with native SQLite-dialect SQL, and idempotent migration system
- src/secrets/store.rs: LibSqlSecretsStore (all 8 trait methods)
- src/tools/wasm/storage.rs: LibSqlWasmToolStore (all 7 trait methods)
- src/main.rs, cli/tool.rs, cli/mcp.rs: backend-conditional wiring
- src/setup/channels.rs: SecretsContext uses Arc<dyn SecretsStore>
- Feature-gate postgres-only tests and examples

Co-Authored-By: Claude Opus 4.6 <[email protected]>

src/agent/agent_loop.rs

@@ -21,7 +21,7 @@ use crate::context::ContextManager;
 use crate::context::JobContext;
 use crate::error::Error;
 use crate::extensions::ExtensionManager;
-use crate::history::Store;
+use crate::db::Database;
 use crate::llm::{ChatMessage, LlmProvider, Reasoning, ReasoningContext, RespondResult};
 use crate::safety::SafetyLayer;
 use crate::tools::ToolRegistry;
@@ -59,7 +59,7 @@ enum AgenticLoopResult {
 ///
 /// Bundles the shared components to reduce argument count.
 pub struct AgentDeps {
-    pub store: Option<Arc<Store>>,
+    pub store: Option<Arc<dyn Database>>,
     pub llm: Arc<dyn LlmProvider>,
     pub safety: Arc<SafetyLayer>,
     pub tools: Arc<ToolRegistry>,
@@ -124,7 +124,7 @@ impl Agent {
     }
 
     // Convenience accessors
-    fn store(&self) -> Option<&Arc<Store>> {
+    fn store(&self) -> Option<&Arc<dyn Database>> {
         self.deps.store.as_ref()
     }
 

src/agent/routine_engine.rs

@@ -23,14 +23,14 @@ use crate::agent::routine::{
 };
 use crate::channels::{IncomingMessage, OutgoingResponse};
 use crate::config::RoutineConfig;
-use crate::history::Store;
+use crate::db::Database;
 use crate::llm::{ChatMessage, CompletionRequest, FinishReason, LlmProvider};
 use crate::workspace::Workspace;
 
 /// The routine execution engine.
 pub struct RoutineEngine {
     config: RoutineConfig,
-    store: Arc<Store>,
+    store: Arc<dyn Database>,
     llm: Arc<dyn LlmProvider>,
     workspace: Arc<Workspace>,
     /// Sender for notifications (routed to channel manager).
@@ -44,7 +44,7 @@ pub struct RoutineEngine {
 impl RoutineEngine {
     pub fn new(
         config: RoutineConfig,
-        store: Arc<Store>,
+        store: Arc<dyn Database>,
         llm: Arc<dyn LlmProvider>,
         workspace: Arc<Workspace>,
         notify_tx: mpsc::Sender<OutgoingResponse>,
@@ -293,7 +293,7 @@ impl RoutineEngine {
 
 /// Shared context passed to the execution function.
 struct EngineContext {
-    store: Arc<Store>,
+    store: Arc<dyn Database>,
     llm: Arc<dyn LlmProvider>,
     workspace: Arc<Workspace>,
     notify_tx: mpsc::Sender<OutgoingResponse>,

src/agent/scheduler.rs

@@ -13,7 +13,7 @@ use crate::agent::worker::{Worker, WorkerDeps};
 use crate::config::AgentConfig;
 use crate::context::{ContextManager, JobContext, JobState};
 use crate::error::{Error, JobError};
-use crate::history::Store;
+use crate::db::Database;
 use crate::llm::LlmProvider;
 use crate::safety::SafetyLayer;
 use crate::tools::ToolRegistry;
@@ -48,7 +48,7 @@ pub struct Scheduler {
     llm: Arc<dyn LlmProvider>,
     safety: Arc<SafetyLayer>,
     tools: Arc<ToolRegistry>,
-    store: Option<Arc<Store>>,
+    store: Option<Arc<dyn Database>>,
     /// Running jobs (main LLM-driven jobs).
     jobs: Arc<RwLock<HashMap<Uuid, ScheduledJob>>>,
     /// Running sub-tasks (tool executions, background tasks).
@@ -63,7 +63,7 @@ impl Scheduler {
         llm: Arc<dyn LlmProvider>,
         safety: Arc<SafetyLayer>,
         tools: Arc<ToolRegistry>,
-        store: Option<Arc<Store>>,
+        store: Option<Arc<dyn Database>>,
     ) -> Self {
         Self {
             config,

src/agent/self_repair.rs

@@ -9,7 +9,7 @@ use uuid::Uuid;
 
 use crate::context::{ContextManager, JobState};
 use crate::error::RepairError;
-use crate::history::Store;
+use crate::db::Database;
 use crate::tools::{BuildRequirement, Language, SoftwareBuilder, SoftwareType, ToolRegistry};
 
 /// A job that has been detected as stuck.
@@ -69,7 +69,7 @@ pub struct DefaultSelfRepair {
     #[allow(dead_code)] // Will be used for time-based stuck detection
     stuck_threshold: Duration,
     max_repair_attempts: u32,
-    store: Option<Arc<Store>>,
+    store: Option<Arc<dyn Database>>,
     builder: Option<Arc<dyn SoftwareBuilder>>,
     #[allow(dead_code)] // Will be used for tool hot-reload after repair
     tools: Option<Arc<ToolRegistry>>,
@@ -94,7 +94,7 @@ impl DefaultSelfRepair {
 
     /// Add a Store for tool failure tracking.
     #[allow(dead_code)] // Public API for configuring repair with persistence
-    pub fn with_store(mut self, store: Arc<Store>) -> Self {
+    pub fn with_store(mut self, store: Arc<dyn Database>) -> Self {
         self.store = Some(store);
         self
     }

src/agent/worker.rs

@@ -11,7 +11,7 @@ use crate::agent::scheduler::WorkerMessage;
 use crate::agent::task::TaskOutput;
 use crate::context::{ContextManager, JobState};
 use crate::error::Error;
-use crate::history::Store;
+use crate::db::Database;
 use crate::llm::{
     ActionPlan, ChatMessage, LlmProvider, Reasoning, ReasoningContext, RespondResult, ToolSelection,
 };
@@ -28,7 +28,7 @@ pub struct WorkerDeps {
     pub llm: Arc<dyn LlmProvider>,
     pub safety: Arc<SafetyLayer>,
     pub tools: Arc<ToolRegistry>,
-    pub store: Option<Arc<Store>>,
+    pub store: Option<Arc<dyn Database>>,
     pub timeout: Duration,
     pub use_planning: bool,
 }
@@ -67,7 +67,7 @@ impl Worker {
         &self.deps.tools
     }
 
-    fn store(&self) -> Option<&Arc<Store>> {
+    fn store(&self) -> Option<&Arc<dyn Database>> {
         self.deps.store.as_ref()
     }
 
@@ -382,7 +382,7 @@ Report when the job is complete or if you encounter issues you cannot resolve."#
         tools: Arc<ToolRegistry>,
         context_manager: Arc<ContextManager>,
         safety: Arc<SafetyLayer>,
-        store: Option<Arc<Store>>,
+        store: Option<Arc<dyn Database>>,
         job_id: Uuid,
         tool_name: &str,
         params: &serde_json::Value,