feat(master): leader-elected planner folds demand events into a cache

crates/lance-context-master/src/config.rs

@@ -16,6 +16,8 @@ pub struct MasterConfig {
     pub append: crate::rollout_append::AppendConfig,
     #[command(flatten)]
     pub wal_tail: crate::wal_tail::WalTailConfig,
+    #[command(flatten)]
+    pub planner: crate::planner::PlannerConfig,
     /// Data directory / object-store prefix shared with the data-plane server.
     #[arg(long, env = "DATA_DIR", default_value = "./data")]
     pub data_dir: String,

crates/lance-context-master/src/lib.rs

@@ -4,6 +4,7 @@ pub mod admission;
 pub mod catchup;
 pub mod config;
 pub mod demand_publish;
+pub mod planner;
 pub use lance_context_merge::demand;
 pub mod discovery;
 pub mod eligibility;