SD-258

[yaml-universal-format] YAML established as universal format for all log and list-like data. One line added to AGENTS.md under Coding Style: “All log and list-like data files use YAML format. Machine-readable, human-readable, lint-checkable, Hugo-compilable. No new TSV, markdown tables, or ad-hoc formats for structured data.” Operator’s reasoning: YAML balances human readability with parseability, is ready for compilation into the oceanheart site, and is easier to add to lint checks than TSV. Existing non-YAML logs flagged for future conversion. docs/internal/keel/slop.yaml created as first YAML-format agent error log.

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