Compute effective staleness for a set of candidates.
Normalizes depths so the minimum becomes 0, then applies the formula: effectiveStaleness = actualStaleness * (normalizedDepth + 1) ^ (depthWeight * emphasis)
Per-meta _emphasis (default 1) multiplies depthWeight, allowing individual metas to tune how much their tree position affects scheduling.
Array of { node, meta, actualStaleness }.
Exponent for depth weighting (0 = pure staleness).
Same array with effectiveStaleness computed.
Compute effective staleness for a set of candidates.
Normalizes depths so the minimum becomes 0, then applies the formula: effectiveStaleness = actualStaleness * (normalizedDepth + 1) ^ (depthWeight * emphasis)
Per-meta _emphasis (default 1) multiplies depthWeight, allowing individual metas to tune how much their tree position affects scheduling.