context_loader.load_context() now accepts a mode param ("chat"|"otr").
In OTR mode, the --- System --- block gains a second line:
Current mode: Off The Record — this conversation is private
and will not be logged or included in memory distillation
routers/chat.py passes mode="otr" when req.off_record is True.
Normal chat and all orchestrator calls stay at mode="chat" (no change
to the System block). The System block consolidates date/time and mode
in one place, matching the existing timestamp pattern.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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