docs(cpex): use the root README as the crate's crates.io page

Add a shared readme to [workspace.package] (resolved from the workspace root)
and inherit it in cpex via readme.workspace = true. cargo bundles the root
README into the published .crate, so crates.io/crates/cpex renders the project
README with no per-crate duplicate. Verified the file is in 'cargo package
--list' and the resolved readme path is ../../README.md.

Signed-off-by: Frederico Araujo <frederico.araujo@ibm.com>

Author: araujof

Cargo.toml

@@ -68,6 +68,10 @@ repository = "https://github.com/contextforge-org/cpex"
 homepage = "https://contextforge-org.github.io/cpex/"
 keywords = ["ai", "agent", "security", "policy", "plugin"]
 categories = ["development-tools"]
+# Shared crate README, resolved relative to this workspace root. Members opt in
+# with `readme.workspace = true` (cpex does, for its crates.io page) so the one
+# root README is the single source — no per-crate copy.
+readme = "README.md"
 
 [workspace.dependencies]
 # Minimal tokio feature floor for crates that take `tokio = { workspace = true }`

crates/cpex/Cargo.toml

@@ -29,6 +29,9 @@ homepage.workspace = true
 keywords.workspace = true
 categories.workspace = true
 rust-version.workspace = true
+# Use the project's root README as this crate's crates.io page (inherited path
+# is workspace-root-relative; cargo bundles it into the published .crate).
+readme.workspace = true
 
 # Build docs.rs with every extension enabled. The default build is engine-only
 # (`default = []`), which omits cpex-builtins entirely — so without this the