feature: add /clear guidance before /cat:work in Next Steps

Users should clear context before starting a new task to avoid
context pollution from previous work.

Changes:
- status_handler.py: NEXT STEPS table shows "/clear then /cat:work"
- work_handler.py: Task complete box shows "/clear then /cat:work"

Author: cowwoc

plugin/hooks/skill_handlers/status_handler.py

@@ -535,7 +535,7 @@ def handle(self, context: dict) -> str | None:
 NEXT STEPS table:
 | Option | Action | Command |
 |--------|--------|---------|
-| [**1**] | Execute a task | `/cat:work {active_minor}-<task-name>` |
+| [**1**] | Execute a task | `/clear` then `/cat:work {active_minor}-<task-name>` |
 | [**2**] | Add new task | `/cat:add` |
 
 Legend: ☑️ Completed · 🔄 In Progress · 🔳 Pending · 🚫 Blocked · 🚧 Gate Waiting

plugin/hooks/skill_handlers/work_handler.py

@@ -115,7 +115,7 @@ def _build_task_complete_low_trust(self) -> str:
             "**Next Up:** {next-task-name}",
             "{goal from PLAN.md}",
             "",
-            "`/cat:work` to continue",
+            "`/clear` then `/cat:work` to continue",
         ]
 
         footer_content = [""]