Adds Serialize/Deserialize to SelectedBookmark and wires it into
SaveStateV1 so a loaded game remembers which bookmark and starting
location the player picked. Replaces the TODO at bookmark/mod.rs:95
(originally deferred to Sprint 37 alongside #614).
Also refactors BookmarkPlugin to accept an injected BookmarkRegistry
via BookmarkPlugin::new(registry) (#862). The Default constructor
still wires the canonical tycoon registry — injection is for tests
and future TOML loading. Flagged in PR #132 review as a follow-up.
Updates bookmark spec §4.4 to remove the v0.2-deferred scope note.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
9f755f2a62