On GameWonEvent, build an AchievementContext from StatsResource + GameState
+ wall-clock hour, evaluate ALL_ACHIEVEMENTS, flip newly-satisfied records
to unlocked, persist atomically, and emit AchievementUnlockedEvent for
each new unlock. AnimationPlugin's toast resolves the event's ID to the
achievement's display name via achievement_plugin::display_name_for.
Introduces StatsUpdate system set so AchievementPlugin can reliably run
after StatsResource reflects the win. AchievementPlugin::headless() used
in tests to avoid touching ~/.local/share/solitaire_quest/achievements.json.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
StatsPlugin loads stats on startup, persists them on every GameWonEvent
and abandoned NewGameRequestEvent (>=1 move, not won), and provides a
full-window overlay toggled with `S` showing games played/won, win rate,
streak, best score, fastest win, and average win time.
The storage path is configurable via StatsPlugin::storage_path: the
default ctor uses dirs::data_dir(); StatsPlugin::headless() disables
I/O entirely so tests don't read or overwrite the user's real
stats.json. record_abandoned runs before GameMutation so it reads
move_count before handle_new_game clobbers it.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
funman300