f74f98e5917e69e916e608a4329c183b65665fb5
SSE payload contract (non-JSON frames carry {data, event}; JSON frames
surface as themselves), the placeholder routing rule (placeholder keys
never double-emit as query; structural path values are INVALID_INPUT),
and the literal-percent trade-off (% in values always encoded; % in
assembly-supplied template text survives — the assembly owns the
upstream-semantics choice, per the ADR-066 trust boundary).
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