Add Godot commit-reveal turn phases

[Vinaystwt]

Summary

• Extend TurnManager with commit/reveal turn phases
• Add commit, reveal, resolve, and finalised phase helpers
• Route commit/reveal payloads through WebBridge
• Emit phase transitions through EventBus
• Store minimal phase and payload metadata in GameState

What changed

• Added phase constants:

  • COMMIT
  • REVEAL
  • RESOLVE
  • FINALIZED

• Added methods:

  • begin_commit
  • submit_commit
  • begin_reveal
  • submit_reveal
  • resolve_turn
  • finalise_turn

• Added defensive WebBridge checks before calling browser/Soroban bridge methods

• Added EventBus web3_error reporting for unavailable bridge paths

• Documented expected commit, reveal, and finalisation payload shapes

Behavior

• Commit/reveal flow stays inside TurnManager
• Blockchain-facing actions are still abstracted behind WebBridge
• Scenes/managers can observe turn state via EventBus
• GameState.metadata records current phase and last commit/reveal/resolution/finalisation payloads
• Generic setup/start/main/end turn flow remains intact

Verification

• git diff --check passed
• Generated artifact scan was clean
• No dist/, .godot/, .import, or .uid artifacts included

Note: Godot/GDScript runtime syntax checks were not run locally because godot/godot4 is not installed in PATH.

[leocagli]

Hi @Vinaystwt 👋 — heads-up that #55 (EventBus autoload) merged to main and touches the same project.godot / export_presets.cfg config this PR changes, so it now conflicts. A quick rebase on latest main (resolving the autoload/export entries) should clear it and I'll merge it right after. Thanks! 🙏

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud