fix(begin): add SpTextfield id prop, versions.toml version note, workspace default-members

- Add `id: String` prop to `SpTextfield` and emit `"id": "{id}"` so the
  DOM `for`/`id` link between `SpFieldLabel` and `SpTextfield` is live.
- Pass `id: field_id` in `inspector.rs` (`SpFieldLabel` keeps `.clone()`
  as the first use; `SpTextfield` moves the value as the second use).
- Add comment to `versions.toml` noting 0.45.4 does not exist on npm
  so future maintainers don't revert to a non-existent version.
- Add `default-members` to root `Cargo.toml` excluding `xtask` from
  `cargo build --workspace` / `cargo test --workspace` default targets.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sean-parent

Cargo.toml

@@ -28,6 +28,13 @@ members = [
     "begin",
     "xtask",
 ]
+default-members = [
+    "cel-runtime",
+    "cel-parser",
+    "cel-rs-macros",
+    "property-model",
+    "begin",
+]
 
 [lib]
 name = "cel_rs"

begin/assets/versions.toml

@@ -4,6 +4,8 @@ url = "https://cdn.jsdelivr.net/npm/d3@7.9.0/dist/d3.min.js"
 file = "d3.v7.min.js"
 
 [spectrum-web-components]
+# 0.45.4 does not exist on npm; 0.45.0 is the latest 0.45.x release.
+# URL uses esm.sh bundled endpoint for a self-contained single-file ESM bundle.
 version = "0.45.0"
 url = "https://esm.sh/@spectrum-web-components/bundle@0.45.0/es2022/elements.bundle.mjs"
 file = "swc.js"

begin/src/inspector.rs

@@ -68,6 +68,7 @@ fn CellRow(id: CellId, sheet: Signal<Sheet>, labels: Signal<Labels>) -> Element
             style: "margin-bottom: 8px;",
             SpFieldLabel { for_: field_id.clone(), "{label}" }
             SpTextfield {
+                id: field_id,
                 value: input.read().clone(),
                 invalid: *has_error.read(),
                 oninput: move |e: FormEvent| {

begin/src/spectrum.rs

@@ -36,6 +36,7 @@ pub fn SpTheme(color: String, scale: String, children: Element) -> Element {
 /// and `aria-invalid`).
 #[component]
 pub fn SpTextfield(
+    id: String,
     value: String,
     invalid: bool,
     oninput: EventHandler<FormEvent>,
@@ -44,6 +45,7 @@ pub fn SpTextfield(
 ) -> Element {
     rsx! {
         sp-textfield {
+            "id": "{id}",
             "value": "{value}",
             // Boolean attribute: omit entirely when false; presence = invalid.
             "invalid": if invalid { "true" },