refactor: replace local DrawMode with upstream klondike::DrawStockConfig (#82)

DrawMode was a 1:1 mirror of klondike::DrawStockConfig (DrawOne/DrawThree).
Delete it and use the upstream type everywhere; re-export DrawStockConfig from
solitaire_core. config_for assigns draw_stock directly and draw_mode() returns
session.config().inner.draw_stock.

Serde is unchanged — DrawStockConfig serialises to the same "DrawOne"/"DrawThree"
named variants, so persisted game_state.json / replay JSON stay byte-compatible
(no migration). Field/method/variable names containing draw_mode are unchanged.

35 files, mechanical type swap across all crates. Implemented via a multi-agent
workflow (core → per-crate consumers → verify). cargo test --workspace and
clippy --workspace --all-targets -- -D warnings green.

Closes #82

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_data/src/weekly.rs

@@ -4,7 +4,7 @@
 //! increments matching counters in `PlayerProgress::weekly_goal_progress`.
 
 use chrono::{Datelike, NaiveDate};
-use solitaire_core::DrawMode;
+use solitaire_core::DrawStockConfig;
 
 /// XP awarded each time a weekly goal is just completed.
 pub const WEEKLY_GOAL_XP: u64 = 75;
@@ -36,7 +36,7 @@ pub struct WeeklyGoalDef {
 pub struct WeeklyGoalContext {
     pub time_seconds: u64,
     pub used_undo: bool,
-    pub draw_mode: DrawMode,
+    pub draw_mode: DrawStockConfig,
 }
 
 impl WeeklyGoalDef {
@@ -47,7 +47,7 @@ impl WeeklyGoalDef {
             WeeklyGoalKind::WinGame => true,
             WeeklyGoalKind::WinWithoutUndo => !ctx.used_undo,
             WeeklyGoalKind::WinUnder { seconds } => ctx.time_seconds < seconds,
-            WeeklyGoalKind::WinDrawThree => ctx.draw_mode == DrawMode::DrawThree,
+            WeeklyGoalKind::WinDrawThree => ctx.draw_mode == DrawStockConfig::DrawThree,
         }
     }
 }
@@ -106,7 +106,7 @@ mod tests {
         WeeklyGoalContext {
             time_seconds: time,
             used_undo: undo,
-            draw_mode: DrawMode::DrawOne,
+            draw_mode: DrawStockConfig::DrawOne,
         }
     }
 
@@ -114,7 +114,7 @@ mod tests {
         WeeklyGoalContext {
             time_seconds: time,
             used_undo: false,
-            draw_mode: DrawMode::DrawThree,
+            draw_mode: DrawStockConfig::DrawThree,
         }
     }