A cron agent runs as platform "cron", so its system prompt only ever got
PLATFORM_HINTS["cron"]. The job's final response lands on the `deliver`
channel (Slack, Telegram, ...), but the model was never told what renders
there: no MEDIA: attachment instructions, no "tables don't render", and a
user's `platform_hints.slack.append` never reached scheduled jobs at all
(community report: Slack-delivered cron jobs stopped sending attachments).
platform_hint() now appends "Delivery destination (<channel>): <hint>" for
cron agents, where <hint> is the channel's built-in/plugin text resolved
through the same `platform_hints.<channel>` override path a live session
uses. The channel comes from the HERMES_CRON_AUTO_DELIVER_PLATFORM
ContextVar the scheduler publishes before the agent runs (the seam
send_message already routes by). Non-cron platforms are untouched.
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