feat: Refactor work item management and documentation for clarity and structure

ai/context/process/context-maintenance.md

@@ -13,7 +13,8 @@ Keep this workspace useful as living memory instead of a pile of disconnected no
 - Use the smallest correct destination:
   - `ai/logs/YYYY-MM-DD.md` for daily progress and evolving findings
   - `ai/state/current.md` for near-term active work
-  - `ai/state/work-items.md` for Jira-linked active work
+  - `ai/work-items/*.md` for canonical Jira-linked active work
+  - `ai/state/work-items.md` for the compact active-work summary
   - `ai/context/` for durable project knowledge
   - `ai/context/people/` for named person context