feat: expose review and eval DAG contracts

Break review orchestration and postprocess into inspectable DAG nodes, add CLI graph introspection for orchestration planning, and salvage parseable comments when frontier responses degrade instead of immediately dropping to fallback.

Made-with: Cursor

Author: haasonsaas

src/commands/eval.rs

@@ -29,3 +29,9 @@ use types::{
     EvalRuleScoreSummary, EvalRunFilters, EvalSuiteResult, EvalVerificationHealth,
     LoadedEvalFixture,
 };
+
+pub(crate) fn describe_eval_fixture_graph(
+    repro_validate: bool,
+) -> crate::core::dag::DagGraphContract {
+    runner::describe_eval_fixture_graph(repro_validate)
+}

src/commands/eval/runner.rs

@@ -3,4 +3,6 @@ mod execute;
 #[path = "runner/matching.rs"]
 mod matching;
 
-pub(super) use execute::{run_eval_fixture, EvalFixtureArtifactContext};
+pub(super) use execute::{
+    describe_eval_fixture_graph, run_eval_fixture, EvalFixtureArtifactContext,
+};

src/commands/eval/runner/execute.rs

@@ -20,6 +20,12 @@ use super::super::{EvalFixtureResult, LoadedEvalFixture};
 
 pub(in super::super) use self::artifact::EvalFixtureArtifactContext;
 
+pub(crate) fn describe_eval_fixture_graph(
+    repro_validate: bool,
+) -> crate::core::dag::DagGraphContract {
+    self::dag::describe_eval_fixture_graph(repro_validate)
+}
+
 pub(in super::super) async fn run_eval_fixture(
     config: &config::Config,
     loaded_fixture: LoadedEvalFixture,