feat(c-abi): expose warmup_period / is_ready across the C ABI bindings (#297)

* feat(c-abi): expose warmup_period / is_ready across the C ABI bindings

The C ABI hub exposed new/update/batch/reset/free per indicator but not the
Indicator::warmup_period / is_ready queries that the native (Python/Node/WASM)
bindings already had, so C/C#/Go/Java/R callers could not ask an indicator
whether it was warmed up without feeding it and watching for NaN.

Regenerated from the ScriptHelpers capi + language generators:
- bindings/c: wickra_<ind>_warmup_period (size_t) and wickra_<ind>_is_ready
  (bool) for every indicator (504; the 10 alt-chart bar builders are excluded
  by design). wickra.h regenerated via cbindgen (additive only).
- bindings/csharp: int WarmupPeriod() / bool IsReady() on each wrapper.
- bindings/go: WarmupPeriod() int / IsReady() bool.
- bindings/java: int warmupPeriod() / boolean isReady().
- bindings/r: C glue + registration; hand-written warmup_period() / is_ready()
  S3 generics in methods.R, plus NAMESPACE exports.

Tests: C-ABI Rust unit tests, the C examples/archetypes.c suite, and the C#,
Go, Java and R archetype suites all gain a warmup/is_ready transition check.

* build(go): sync vendored wickra.h with the C ABI header

The Go binding vendors bindings/c/include/wickra.h; refresh it with the new
warmup_period / is_ready declarations so the CI sync check passes.

bindings/r/R/methods.R

@@ -76,3 +76,45 @@ reset.wickra_indicator <- function(object) {
   .Call(paste0("wk_", object$prefix, "_reset"), object$ptr, PACKAGE = "wickra")
   invisible(object)
 }
+
+#' Number of updates an indicator needs before it produces a value
+#'
+#' Not available for the alt-chart bar builders ([RenkoBars()], [KagiBars()],
+#' [PointAndFigureBars()], …), which have no warmup.
+#'
+#' @param object A `wickra_indicator`.
+#' @return A single integer: the warmup period.
+#' @examples
+#' warmup_period(Sma(14)) # 14
+#' @export
+warmup_period <- function(object) {
+  UseMethod("warmup_period")
+}
+
+#' @rdname warmup_period
+#' @export
+warmup_period.wickra_indicator <- function(object) {
+  .Call(paste0("wk_", object$prefix, "_warmup_period"), object$ptr, PACKAGE = "wickra")
+}
+
+#' Whether an indicator has consumed enough input to emit a value
+#'
+#' Not available for the alt-chart bar builders, which have no warmup.
+#'
+#' @param object A `wickra_indicator`.
+#' @return A single logical.
+#' @examples
+#' sma <- Sma(3)
+#' is_ready(sma) # FALSE
+#' for (x in c(1, 2, 3)) update(sma, x)
+#' is_ready(sma) # TRUE
+#' @export
+is_ready <- function(object) {
+  UseMethod("is_ready")
+}
+
+#' @rdname is_ready
+#' @export
+is_ready.wickra_indicator <- function(object) {
+  .Call(paste0("wk_", object$prefix, "_is_ready"), object$ptr, PACKAGE = "wickra")
+}