docs: templates de frontmatter YAML para function, pipeline, component y type

Añade plantillas de referencia que documentan el formato exacto
del frontmatter YAML que cada .md debe seguir. Cubren los cuatro
kinds: function, pipeline, component y type.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/templates/pipeline.md

@@ -0,0 +1,31 @@
+---
+name: tick_to_ohlcv
+kind: pipeline
+lang: go
+domain: finance
+version: "1.0.0"
+purity: impure
+signature: "func TickToOHLCV(ctx context.Context, symbol string, interval time.Duration) ([]OHLCV, error)"
+description: "Pipeline que obtiene ticks de un exchange y los agrega en velas OHLCV."
+tags: [pipeline, finance, ohlcv, ticks]
+uses_functions: [fetch_ticks_go_io, aggregate_ohlcv_go_finance]
+uses_types: [ohlcv_go_finance, tick_go_finance]
+returns: [ohlcv_go_finance]
+returns_optional: false
+error_type: "error_go_core"
+imports: []
+tested: false
+tests: []
+test_file_path: ""
+file_path: "functions/pipelines/tick_to_ohlcv.go"
+---
+
+## Ejemplo
+
+```go
+candles, err := TickToOHLCV(ctx, "BTCUSDT", 5*time.Minute)
+```
+
+## Notas
+
+Pipeline impuro: orquesta fetch_ticks (IO) y aggregate_ohlcv (pura).