feat: get_categories tool, author resolution in get_activities, update CLAUDE.md (v0.4.8)

- get_categories(list_id): new tool filtering taskcategorysync by
  sortingIndexByTaskList, returns {id, name, emoji} ordered by sort index
- get_activities: author IDs now resolved to display names (firstName) via
  famlistfamily members; raw author_id preserved as separate field; member
  lookup is non-fatal (falls back to raw ID on error)
- CLAUDE.md: tools table updated to reflect all implemented tools (v0.4.8)
- SPEC.md: full accgetallfamily response structure documented including
  categories[] on tasks and category parameter investigation findings
- Category assignment in create/update task: all tested parameter names
  ignored by API; still to verify (Service Worker blocks web inspection)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -2,7 +2,7 @@
 
 MCP server for [Family Wall](https://www.familywall.com) -- read and manage your family's circles, lists, and tasks directly from Claude.
 
-## Features (v0.4.7)
+## Features (v0.4.8)
 
 ### Read
 
@@ -10,7 +10,8 @@ MCP server for [Family Wall](https://www.familywall.com) -- read and manage your
 - `get_members` -- list members of a circle (or all circles)
 - `get_lists` -- list all task lists (optionally filtered by circle)
 - `get_tasks` -- list tasks in a specific list
-- `get_activities` -- list recent wall activities
+- `get_categories` -- list categories available for a list
+- `get_activities` -- list recent wall activities (author resolved to display name)
 
 ### Write (with confirmation prompt)