Integrate Codex patterns: task scheduler, TUI, sessions, compaction

Add Codex-inspired patterns for improved agent architecture:

**Task Scheduler (Phase 1 & 4)**
- New Task enum with Job, ToolExec, Background variants
- TaskHandler trait for custom background tasks
- Scheduler.spawn_subtask() and spawn_batch() for parallel execution
- Worker executes multiple tools in parallel via futures::join_all

**Tool Approval System (Phase 6)**
- Tool.requires_approval() method (default false for sandboxed tools)
- HttpTool marked as requiring approval (external network)
- MCP protocol annotations: destructive_hint, side_effects_hint

**Ratatui TUI CLI (Phase 2)**
- Replace blocking stdin with event-driven TUI
- ChatComposer with history navigation and tab completion
- ApprovalOverlay modal with y/n/a keyboard shortcuts
- Raw mode with proper terminal cleanup

**Session/Turn Model (Phase 3)**
- Session, Thread, Turn structs for conversation tracking
- Submission enum for user input, approvals, undo, interrupt
- UndoManager with checkpoint-based undo/redo

**Context Compaction (Phase 5)**
- ContextMonitor with token estimation and threshold checks
- CompactionStrategy: Summarize, Truncate, MoveToWorkspace
- ContextCompactor writes summaries to workspace daily logs

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/tools/wasm/storage.rs

@@ -553,9 +553,7 @@ fn row_to_tool(row: &tokio_postgres::Row) -> Result<StoredWasmTool, WasmStorageE
         trust_level: trust_level_str
             .parse()
             .map_err(WasmStorageError::InvalidData)?,
-        status: status_str
-            .parse()
-            .map_err(WasmStorageError::InvalidData)?,
+        status: status_str.parse().map_err(WasmStorageError::InvalidData)?,
         created_at: row.get("created_at"),
         updated_at: row.get("updated_at"),
     })