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remove hardcoded msft default, document publisher config instead

Per review feedback, removes the default msft bidder config from
getModuleConfig to avoid publishers upgrading solely for built-in
compatibility. Publishers now need to explicitly configure the
bidders param for msft custom cohorts. Updated docs with example config.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>