chore: auto-commit (57 archivos)

- frontend/functions/core/format_datetime_short.md
- frontend/functions/core/format_datetime_short.test.ts
- frontend/functions/core/format_datetime_short.ts
- frontend/functions/core/format_duration.md
- frontend/functions/core/format_duration.test.ts
- frontend/functions/core/format_duration.ts
- frontend/functions/core/month_grid.md
- frontend/functions/core/month_grid.test.ts
- frontend/functions/core/month_grid.ts
- frontend/functions/core/string_hash_palette.md
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/datascience/duration_stats.go

@@ -0,0 +1,27 @@
+package datascience
+
+import "sort"
+
+// DurationStatsFrom computes descriptive statistics for a slice of durations in milliseconds.
+// It sorts a local copy so the original slice is not mutated.
+// Returns a zero-value DurationStats when the input is empty.
+func DurationStatsFrom(durations []int64) DurationStats {
+	n := len(durations)
+	if n == 0 {
+		return DurationStats{}
+	}
+	cp := make([]int64, n)
+	copy(cp, durations)
+	sort.Slice(cp, func(i, j int) bool { return cp[i] < cp[j] })
+	var sum int64
+	for _, d := range cp {
+		sum += d
+	}
+	return DurationStats{
+		N:     n,
+		AvgMs: sum / int64(n),
+		P50Ms: Percentile(cp, 0.5),
+		P90Ms: Percentile(cp, 0.9),
+		P99Ms: Percentile(cp, 0.99),
+	}
+}