Prefix all getters with "get"

Rename bare-noun value accessors to start with "get", per the coding
guideline that a getter's name should begin with "get". Covers simple
nullary accessors across the simulation, balancing, and UI layers
(e.g. currentTick -> getCurrentTick, config -> getConfig,
buildings/belts/ships/scraps/admin, threatLevel, artifactCount,
tilePx, viewportRect, Hasher::value -> getValue, Formula::source ->
getSource).

Left untouched by design: boolean predicates (is*/has*/can*),
verb-named lookups/computations (find*/compute*/peek*/create*),
coordinate transforms, and existing set*-prefixed setters. Test-only
helpers and std/toml++ accessors (optional::value, parse_error::source)
were deliberately not renamed.

Builds clean; all 406 test cases (3222 assertions) pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc

src/ui/ShipLayoutDialog.cpp

@@ -578,7 +578,7 @@ ShipLayoutDialog::ShipLayoutDialog(const GameConfig* config,
     });
 }
 
-std::optional<ShipLayoutConfig> ShipLayoutDialog::result() const
+std::optional<ShipLayoutConfig> ShipLayoutDialog::getResult() const
 {
     return m_result;
 }