feat: add file editing tools for all backends#8
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Add 12 new MCP tools (4 per backend) that provide proper file reading, writing, editing, and listing inside containers. These mirror the familiar view/edit/create pattern used by AI coding agents, eliminating the need to construct fragile shell commands via exec/ssh. New tools per backend (devpod_, devcontainer_, codespaces_): - file_read: Read file content with optional line range (1-based) - file_write: Create/overwrite files with automatic parent dir creation - file_edit: Surgical old_str → new_str replacement (must match once) - file_list: List directory contents (non-hidden, up to 2 levels) Implementation: - New file_ops module with server-side edit logic (apply_edit) and shell command builders (base64-encoded writes for safe transport) - Backend wrappers in devpod.rs, devcontainer.rs, codespaces.rs - FileRead and FileEdit error variants in error.rs - Unit tests for edit logic, line formatting, and shell escaping
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Add 12 new MCP tools (4 per backend) that provide proper file reading, writing, editing, and listing inside containers. These mirror the familiar view/edit/create pattern used by AI coding agents, eliminating the need to construct fragile shell commands via exec/ssh.
New tools per backend (devpod_, devcontainer_, codespaces_):
Implementation: