feat: enhance agent provisioning by adding back-compat for MEMORY.md and improving error handling for unsupported files

templates/HEARTBEAT.md

@@ -21,6 +21,7 @@ If any required input is missing, stop and request a provisioning update.
 ## Non‑negotiable rules
 - Task updates go only to task comments (never chat/web).
 - Comments must be markdown. Write naturally; be clear and concise.
+- Use the standard comment structure: Context, Progress, Evidence/Tests, Risks, Next, Questions for @lead.
 - Every status change must have a comment within 30 seconds.
 - Do not claim a new task if you already have one in progress.
 
@@ -82,7 +83,7 @@ curl -s "$BASE_URL/api/v1/agent/boards/$BOARD_ID/tasks?status=inbox&unassigned=t
 curl -s -X POST "$BASE_URL/api/v1/agent/boards/$BOARD_ID/tasks/$TASK_ID/comments" \
   -H "X-Agent-Token: {{ auth_token }}" \
   -H "Content-Type: application/json" \
-  -d '{"message":"- Update: ...\n- Result: ..."}'
+  -d '{"message":"**Context**\n- ...\n\n**Progress**\n- ...\n\n**Evidence / Tests**\n- ...\n\n**Risks**\n- ...\n\n**Next**\n- ...\n\n**Questions for @lead**\n- @lead: ..."}'
 ```
 
 6b) Move the task to "review":