Module backend 

KernelBackend trait for abstracting kaish’s I/O layer.

This module defines the KernelBackend trait which provides a unified interface for file operations and tool dispatch. Two implementations are provided:

• LocalBackend: Default implementation wrapping VfsRouter for local filesystem access
• (Future) KaijutsuBackend: CRDT-backed blocks when running under kaijutsu

Architecture

Builtins (cat, ls, echo, etc.)
    ↓
ctx.backend: Arc<dyn KernelBackend>
    ↓
┌─────────────────────────────────────────────┐
│  LocalBackend (default)  │  KaijutsuBackend │
│  - wraps VfsRouter       │  - CRDT blocks   │
│  - local ToolRegistry    │  - parent tools  │
└─────────────────────────────────────────────┘

Structs

ConflictError

Error when CAS (compare-and-set) check fails during patching.

LocalBackend

Local backend implementation using VfsRouter and ToolRegistry.

ReadRange

Range specification for partial file reads.

ToolInfo

Information about an available tool.

ToolResult

Result from tool execution via backend.

VirtualOverlayBackend

Backend that overlays virtual paths (/v/*) on top of a custom backend.

Enums

BackendError

Backend operation errors.

PatchOp

Generic patch operation for file modifications.

WriteMode

Write mode for file operations.

Traits

KernelBackend

Abstract backend interface for file operations and tool dispatch.

Type Aliases

BackendResult

Result type for backend operations.