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.md

@@ -0,0 +1,55 @@
+---
+name: duration_stats
+kind: function
+lang: go
+domain: datascience
+version: "1.0.0"
+purity: pure
+signature: "func DurationStatsFrom(durations []int64) DurationStats"
+description: "Calcula estadisticas descriptivas (N, media, P50/P90/P99) de un slice de duraciones en milisegundos. Ordena una copia local sin mutar el input. Retorna DurationStats{} para slice vacio."
+tags: [statistics, duration, percentile, metrics, int64]
+uses_functions:
+  - percentile_int64_go_datascience
+uses_types:
+  - DurationStats_go_datascience
+returns:
+  - DurationStats_go_datascience
+returns_optional: false
+error_type: ""
+imports:
+  - sort
+params:
+  - name: durations
+    desc: "Slice de duraciones en milisegundos. No necesita estar ordenado; se ordena internamente sobre una copia."
+output: "DurationStats con N, AvgMs, P50Ms, P90Ms y P99Ms calculados. DurationStats{} si el slice esta vacio."
+tested: true
+tests:
+  - "slice vacio retorna estadisticas cero"
+  - "un solo elemento produce estadisticas identicas"
+  - "cinco elementos calcula media y percentiles correctos"
+  - "input original no se muta"
+  - "diez elementos p90 usa idx truncado"
+test_file_path: "functions/datascience/duration_stats_test.go"
+file_path: "functions/datascience/duration_stats.go"
+source_repo: "https://github.com/egutierrez/fn_registry/apps/kanban"
+source_license: "private"
+source_file: "apps/kanban/backend/metrics.go"
+---
+
+## Ejemplo
+
+```go
+durations := []int64{50, 10, 30, 40, 20}
+stats := DurationStatsFrom(durations)
+// stats.N     = 5
+// stats.AvgMs = 30
+// stats.P50Ms = 30
+// stats.P90Ms = 50
+// stats.P99Ms = 50
+```
+
+## Notas
+
+Ordena una copia con `sort.Slice` para no mutar el slice original.
+Compone `Percentile` (`percentile_int64_go_datascience`) para los calculos de P50/P90/P99.
+Extraido y generalizado desde `apps/kanban/backend/metrics.go:113-130`.