feat: update Mattermost rendering guidelines for standups and enhance daily logs with recent validation details

.agents/rules/status-reporting.md

@@ -22,4 +22,5 @@ Use this skill for standups, daily scrum updates, end-of-day summaries, and shor
 - Use explicit work-item ID and title when available.
 - Keep the report concise and ready to send.
 - Do not mention internal evidence sources unless the user asks.
+- For Mattermost-ready standups, include a visible blank line before section headers such as `Today:` and `Blockers:`. Always verify there is an empty line immediately above `Today:` before returning the draft.
 - Use `Blockers: None` only when no blocker is visible in current memory.

.agents/workflows/standup.md

@@ -140,4 +140,5 @@ Return a standup that is:
 - uses `JIRA-ID - Title` or `JIRA-ID Title` formatting instead of comma-separated ID/title formatting
 - preserves chronological order within each Jira item's sub-bullets
 - omits future-sprint stories from `Today` unless they are real blockers
+- includes a visible blank line before `Today:` and before `Blockers:` when present; before returning, verify there is an empty line immediately above each section header so Mattermost renders it correctly
 - is ready to copy/paste into Mattermost as Markdown