E9: complete the published crate manifests

The three published crates had no documentation link and no docs.rs
configuration, so wickra-data's feature-gated live-binance module would
not render on docs.rs.

Add documentation = "https://docs.rs/<crate>" and a
[package.metadata.docs.rs] section with all-features = true to
wickra-core, wickra, and wickra-data. No `exclude` is added: each crate
directory contains only src/ (plus benches/examples that are useful
source), so there is nothing irrelevant to drop from the .crate.

crates/wickra-core/Cargo.toml

@@ -11,6 +11,12 @@ homepage.workspace = true
 readme.workspace = true
 keywords.workspace = true
 categories.workspace = true
+documentation = "https://docs.rs/wickra-core"
+
+# Render the docs on docs.rs with every feature enabled so the parallel
+# (rayon-backed) batch APIs are documented.
+[package.metadata.docs.rs]
+all-features = true
 
 [lints]
 workspace = true

crates/wickra-data/Cargo.toml

@@ -11,6 +11,12 @@ homepage.workspace = true
 readme.workspace = true
 keywords.workspace = true
 categories.workspace = true
+documentation = "https://docs.rs/wickra-data"
+
+# Render the docs on docs.rs with every feature enabled so the optional
+# live-binance feed is documented (otherwise it is hidden behind its feature).
+[package.metadata.docs.rs]
+all-features = true
 
 [lints]
 workspace = true

crates/wickra/Cargo.toml

@@ -11,6 +11,11 @@ homepage.workspace = true
 readme.workspace = true
 keywords.workspace = true
 categories.workspace = true
+documentation = "https://docs.rs/wickra"
+
+# Render the docs on docs.rs with every feature enabled.
+[package.metadata.docs.rs]
+all-features = true
 
 [lints]
 workspace = true