v0.4.20260304

A release-sized update focused on expanding playable coverage, ending sequences, and engine maturity.

• Package rename from uk.co.jamesj999.sonic to com.openggf across the entire codebase.
• Master title screen implemented: engine-wide PNG-based title screen with animated clouds, game
  selection, and pixel font renderer. Displayed on startup before entering game-specific title flow.
• Sonic 1 has moved from initial support to feature complete: title screen flow, special
  stages, major per-zone event scripting, extensive object and badnik additions, multiple boss
  implementations (GHZ, MZ, SYZ, LZ, SLZ, FZ), Labyrinth water/drowning/splash behaviour,
  ending/credits work, SBZ post-level-end sequence, demo playback, edge balance and push block
  collision corrections, and slope crest sensor guard. Expect minor bugs, but the game should be playable
  from beginning to end.
• Sonic 2 adds title screen support, major object passes for MTZ/SCZ/WFZ/OOZ, 9 boss fights
  (MCZ, MTZ, WFZ, and both DEZ bosses — Mecha Sonic and Death Egg Robot, plus Robotnik escape),
  a complete credits and ending cutscene system with ROM-accurate visuals, expanded per-zone event
  architecture, demo playback, signpost/badnik palette/stair block art fixes, and a systematic
  TODO resolution pass with disassembly validation.
• Sonic 3&K sees major AIZ progress including intro cutscene systems, hollow tree and vine
  traversal parity work, miniboss object set bring-up, initial badnik implementations, shield/PLC
  integration fixes, a full water system with provider architecture and underwater palettes,
  seamless AIZ fire transition flow, and related regressions/tests.
• Cross-game feature donation implemented: a donor game (S2 or S3K) can provide player sprites,
  spindash dust, physics, palettes, and SFX while the base game handles levels, collision, objects,
  and music. Now includes cross-game Super Sonic delegation.
• Per-game physics and Super Sonic state/control flow (implemented for S2, with cross-game
  delegation to S1 and S2 game modules).
• Profile-driven level loading: declarative LevelInitProfile system with 13 ROM-aligned
  steps per game, replacing the monolithic loadLevel() path.
• Testability refactor: GameContext, SharedLevel, HeadlessTestFixture builder, and
  profile-driven test teardown. Test grouping by level and 8-JVM parallel execution.
• Engine fixes: solid object edge jitter fix, S1 slope crest sensor guard, jump-while-airborne
  guard, fade transition flash fix, results screen rendering fix, HTZ earthquake fixes, SFX
  channel replacement fix.
• PLC/art-loader refactors, RomOffsetFinder/ObjectDiscoveryTool enhancements, configuration
  documentation, and broad audio/stability/performance hardening.

See CHANGELOG.md for full details.

Full Changelog: v0.3.20260206...v0.4.20260304