docs: rename docs to 001-004 migration-style numbering

docs/backend/004_manage_cards_spec.md

@@ -3,6 +3,7 @@
 **Feature:** US: Manage Trello Cards
 **Issue:** #4
 **Branch:** `feature/manage-cards`
+**Doc:** 004
 
 ## Overview
 

docs/backend/manage-lists-spec.md

@@ -1,88 +0,0 @@
-# Trello Plugin — Manage Trello Lists
-
-**Feature:** US: Manage Trello Lists
-**Issue:** #3
-**Branch:** `feature/manage-lists`
-
-## Overview
-
-Extends the Trello plugin with list management capabilities: create, rename, archive, and reposition lists on a Trello board.
-
-## Design Decisions
-
-- **Lists require a board context** — Creating a list needs a board ID. Other operations (rename, archive, move) use the list's Trello ID which is globally unique.
-- **Position parameter** — Uses Trello's `pos` field which accepts `"top"`, `"bottom"`, or a positive number.
-
-## Tools
-
-### `trello_create_list`
-
-Create a new list on a board.
-
-**Parameters:**
-| Param | Type | Required | Description |
-|-------|------|----------|-------------|
-| `name` | string | Yes | List name |
-| `board_id` | string | Yes | Board ID or name |
-| `pos` | string | No | Position: `"top"`, `"bottom"`, or number (default: `"bottom"`) |
-
-**Returns:**
-```json
-{"success": true, "list": {"id": "l1", "name": "My List", "id_board": "b1"}}
-```
-
-### `trello_rename_list`
-
-Rename an existing list.
-
-**Parameters:**
-| Param | Type | Required | Description |
-|-------|------|----------|-------------|
-| `list_id` | string | Yes | List ID |
-| `name` | string | Yes | New name |
-
-**Returns:**
-```json
-{"success": true, "list": {"id": "l1", "name": "Renamed List"}}
-```
-
-### `trello_archive_list`
-
-Archive a list.
-
-**Parameters:**
-| Param | Type | Required | Description |
-|-------|------|----------|-------------|
-| `list_id` | string | Yes | List ID |
-
-**Returns:**
-```json
-{"success": true, "message": "List 'My List' archived."}
-```
-
-### `trello_move_list`
-
-Move a list to a different position.
-
-**Parameters:**
-| Param | Type | Required | Description |
-|-------|------|----------|-------------|
-| `list_id` | string | Yes | List ID |
-| `pos` | string | Yes | Position: `"top"`, `"bottom"`, or a number |
-
-**Returns:**
-```json
-{"success": true, "message": "List 'My List' moved."}
-```
-
-## Trello API Endpoints
-
-| Purpose | Method | Endpoint |
-|---------|--------|----------|
-| Create list | POST | `/1/lists` |
-| Update list (rename, archive, move) | PUT | `/1/lists/{id}` |
-
-## Error Handling
-
-- List not found → clear error message
-- Board not found when creating → propagate board lookup error