feat(ml): scaffold sub-crate directory structure for ml split

Add 5 empty sub-crates (ml-core, ml-dqn, ml-ppo, ml-supervised, ml-infra)
to workspace. Modules will be moved from monolithic ml crate in subsequent
tasks.

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

Cargo.toml

@@ -109,6 +109,11 @@ members = [
     "crates/risk-data",
     "crates/trading-data",
     "crates/ml",
+    "crates/ml-core",
+    "crates/ml-dqn",
+    "crates/ml-ppo",
+    "crates/ml-supervised",
+    "crates/ml-infra",
     "crates/ml-data",
     "crates/data",
     "crates/backtesting",
@@ -384,6 +389,11 @@ risk = { path = "crates/risk" }
 risk-data = { path = "crates/risk-data" }
 backtesting = { path = "crates/backtesting" }
 ml = { path = "crates/ml", default-features = false }
+ml-core = { path = "crates/ml-core" }
+ml-dqn = { path = "crates/ml-dqn" }
+ml-ppo = { path = "crates/ml-ppo" }
+ml-supervised = { path = "crates/ml-supervised" }
+ml-infra = { path = "crates/ml-infra" }
 common = { path = "crates/common" }
 storage = { path = "crates/storage" }
 market-data = { path = "crates/market-data" }

crates/ml-core/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "ml-core"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+publish.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "Shared ML types, traits, features, and data loading"
+
+[dependencies]
+
+[lints]
+workspace = true

crates/ml-core/src/lib.rs

@@ -0,0 +1 @@
+// Modules will be moved here from ml crate

crates/ml-dqn/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "ml-dqn"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+publish.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "DQN reinforcement learning"
+
+[dependencies]
+ml-core.workspace = true
+
+[lints]
+workspace = true

crates/ml-dqn/src/lib.rs

@@ -0,0 +1 @@
+// Modules will be moved here from ml crate

crates/ml-infra/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "ml-infra"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+publish.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "Training infrastructure (hyperopt, ensemble, trainers)"
+
+[dependencies]
+ml-core.workspace = true
+ml-dqn.workspace = true
+ml-ppo.workspace = true
+ml-supervised.workspace = true
+
+[lints]
+workspace = true

crates/ml-infra/src/lib.rs

@@ -0,0 +1 @@
+// Modules will be moved here from ml crate

crates/ml-ppo/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "ml-ppo"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+publish.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "PPO reinforcement learning"
+
+[dependencies]
+ml-core.workspace = true
+
+[lints]
+workspace = true

crates/ml-ppo/src/lib.rs

@@ -0,0 +1 @@
+// Modules will be moved here from ml crate

crates/ml-supervised/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "ml-supervised"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+publish.workspace = true
+keywords.workspace = true
+categories.workspace = true
+description = "Supervised models (TFT, Mamba, Liquid, TGGN, TLOB, KAN, xLSTM, Diffusion)"
+
+[dependencies]
+ml-core.workspace = true
+
+[lints]
+workspace = true

crates/ml-supervised/src/lib.rs

@@ -0,0 +1 @@
+// Modules will be moved here from ml crate