refactor: persist replay/save moves as KlondikeInstruction, not pile coords (#89)

Pile-position types (Tableau, Foundation, KlondikePile, KlondikePileStack)
are runtime-only and have no serde upstream. Per Rhys's guidance, the
persistence layer now stores the moves (KlondikeInstruction) rather than
board coordinates, decoding back to runtime pile positions on demand.

Core / data:
- game_state: instruction_history() -> Vec<KlondikeInstruction>; add
  instruction_to_piles() and apply_instruction(); drop AnyInstruction.
- klondike_adapter: delete the entire Saved* serde mirror section
  (SavedTableau/Foundation/SkipCards/KlondikePile/TableauStack/
  KlondikePileStack/DstFoundation/DstTableau/SavedInstruction).
- replay: drop the bespoke ReplayMove serde mirror; Replay.moves is now
  Vec<KlondikeInstruction>; REPLAY_SCHEMA_VERSION 2 -> 3.
- storage: game_state save format v3 rejected (v4/v5 only).

Engine / wasm consumers:
- record via KlondikeInstruction (stock click = RotateStock).
- playback decodes each instruction to (from, to, count) against the
  live state via instruction_to_piles, then fires the canonical event;
  undecodable instructions are skipped with a warning, never panic.
- remove all use solitaire_data::ReplayMove and Saved* imports.

Workspace check, clippy -D warnings, and the full test suite all pass.

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

solitaire_engine/src/replay_overlay/update.rs

@@ -8,8 +8,7 @@ use super::*;
 use crate::layout::LayoutResource;
 use crate::replay_playback::ReplayPlaybackState;
 use crate::resources::GameStateResource;
-use solitaire_core::KlondikePile;
-use solitaire_data::ReplayMove;
+use solitaire_core::{KlondikeInstruction, KlondikePile};
 
 /// Overwrites the banner label whenever the resource changes — covers the
 /// `Playing → Completed` transition by swapping "▌ replay" for
@@ -85,9 +84,15 @@ pub(crate) fn update_floating_progress_chip(
     // the most-recently-applied move sits at `cursor - 1`.
     let dest_pile = match state.as_ref() {
         ReplayPlaybackState::Playing { replay, cursor, .. } if *cursor > 0 => {
+            // The destination pile is recoverable directly from the
+            // instruction — no live state needed. `RotateStock` has no
+            // destination (the chip hides over the stock pile).
             match &replay.moves[cursor - 1] {
-                ReplayMove::Move { to, .. } => Some(*to),
-                ReplayMove::StockClick => None,
+                KlondikeInstruction::DstFoundation(dst) => {
+                    Some(KlondikePile::Foundation(dst.foundation))
+                }
+                KlondikeInstruction::DstTableau(dst) => Some(KlondikePile::Tableau(dst.tableau)),
+                KlondikeInstruction::RotateStock => None,
             }
         }
         _ => None,
@@ -95,8 +100,7 @@ pub(crate) fn update_floating_progress_chip(
 
     let Some(world_pos) = dest_pile
         .as_ref()
-        .and_then(|p| KlondikePile::try_from(*p).ok())
-        .and_then(|p| layout.0.pile_positions.get(&p).copied())
+        .and_then(|p| layout.0.pile_positions.get(p).copied())
     else {
         // Nothing to point at — hide every chip and exit.
         for (_, mut visibility, _) in chips.iter_mut() {