CB-WP-0048 T01: Configuration and Rules — identity split from behaviour

catalog.rs reads ground-game's schema 2 and refuses an unknown schema by
name: a reader that silently accepted schema 1 would answer questions
about aspects over a file that has none.

config.rs holds the two types ADR-0022 chose. Configuration is identity
and round-trips anything the catalog names, including modules with no
kernel path; Rules is behaviour, exhaustive, no catch-all. resolve() is
the boundary and emits the two distinct errors -- "known module with no
kernel path (status: proposed)" vs "not a module the catalog has" --
which is the entire reason this shape was chosen over a per-aspect enum.

Nothing about aspects, defaults or module status is written in our
source; all of it is read. The tests find the proposed module by
searching for status: proposed rather than naming one, so implementing
it upstream makes the test look elsewhere instead of going stale.

Four mutations, four red. scoped_plus_attack_soothe now resolves -- the
combination the three-armed enum could not express.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

games/ground/src/lib.rs

@@ -16,6 +16,19 @@ pub mod bot;
 /// only one of them is optional.
 pub mod edition;
 
+/// ground-game's rules catalog, schema 2 (CB-WP-0048, ADR-0022).
+///
+/// Gated with `scenarios` because it parses YAML and that is where
+/// `serde_yaml` lives. The *identity* type in `config` is not gated: a
+/// configuration must be readable off a recording whether or not this
+/// build can validate it against the catalog.
+#[cfg(feature = "scenarios")]
+pub mod catalog;
+
+/// A configuration is a point in aspect space (ADR-0022).
+#[cfg(feature = "scenarios")]
+pub mod config;
+
 /// K13's per-player projection (CB-WP-0008 T02) — the trait's first
 /// implementor. Needs the runtime's `Project`, which the game already
 /// depends on, so it is not feature-gated either.