- stderr and null drivers; per-component levels from log.components
- SUMMER_LOG__ overrides parse as strings and overlay the defaults key by key
- Validation names the key: driver, format, level, days, stack children and cycles, daily path outside the root
- summer new writes config/log.yaml (stack of console and daily, river warn, http info)
- docs/services/logging.md: channels, config/log.yaml, component loggers, daily files, redaction
- Log keys in the configuration docs; ExampleFor backs the docs snippet
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