sneak d5bebb8408 Render unknown for a zero CreatedAt in Slack/Mattermost messages (closes #298) ...

FormatSlackMessage rendered the Timestamp line unconditionally, so a
reaped-row fallback delivery carried "0001-01-01T00:00:00Z" -- the
exact string #257 was filed
against, indistinguishable from that regression. When
event.CreatedAt.IsZero(), render "unknown" instead; a real CreatedAt
still renders as RFC3339.

2026-08-24 15:46:58 +00:00

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