docs(architecture): bring source-of-truth docs to post-migration reality

ARCHITECTURE.md predated the card_game migration (PR #88, 2026-06-22)
and still documented the pre-migration core: local Card with face_up,
PileType, stored score/undo/recycle, and a snapshot undo stack. Rewrites
the Core Game Models section around the upstream card_game/klondike
types and the derived-stats/replay-undo model, updates the
solitaire_core crate section (deps + ownership), adds solitaire_web and
solitaire_assetgen to the workspace tree, and corrects the
solitaire_app and Settings entries. Version bumped to 1.4.

Also adds the two missing crates to the CLAUDE.md crate map (AGENTS.md,
its gitignored local twin, was regenerated in place) and records the
full device checklist passing on the Fold 7 in SESSION_HANDOFF.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CLAUDE.md

@@ -30,7 +30,9 @@ solitaire_data/    # Persistence + sync client
 solitaire_engine/  # Bevy ECS + UI + gameplay orchestration
 solitaire_server/  # Axum backend (optional sync layer)
 solitaire_wasm/    # WASM bindings for browser-side replay player
-solitaire_app/     # Entry binary
+solitaire_web/     # Bevy WASM canvas build for the browser /play route
+solitaire_assetgen/ # One-shot card/background PNG asset generator
+solitaire_app/     # Entry binary (desktop + Android cdylib)
 assets/            # Runtime assets (except audio + default theme)
 ```