docs: fix supplier ActivityDefinition rule path syntax

Use context.* field paths and {context.*} placeholders to match
activity-core rule evaluator conventions.

docs/integrations/activity-definitions/weekly-coach-orientation.md

@@ -33,15 +33,15 @@ returns one `scheduled_run` per `(repo, agent)`; this definition selects the
 id: run-weekly-coach
 for_each: context.scheduled_runs
 bind_as: r
-condition: 'r.agent == "coach" and r.enabled == true'
+condition: 'context.r.agent == "coach" and context.r.enabled'
 action:
-  task_template: "Weekly coach orientation: {{r.repo}}"
+  task_template: "Weekly coach orientation: {context.r.repo}"
   description: |
-    {{r.prepare_command}}
+    {context.r.prepare_command}
     Then load agents/agent-coach.md in a coding-agent session, paste the
     prepared bundle, and follow the coach synthesis. At session close:
     kaizen-agentic metrics record coach --success --time <s> --quality <0-1>
-  target_repo: "{{r.repo}}"
+  target_repo: context.r.repo
   priority: medium
   labels: ["kaizen", "agent-run", "coach", "scheduled", "automated"]
 ```