feat: add typed event data pipeline with loader registry

[remo-lab]

Summary

PhoenixLoader.loadObjectTypes() was 290 lines of if/else chains. Adding a new object type meant editing core code, and experiment loaders had to override the entire method just to add one custom type. Replaced it with a declarative registry. Also added proper TypeScript interfaces for event data and fixed a bug in Edm4hepJsonLoader where getRunNumber() and getEventNumber() had inverted logic.

Changes

• src/lib/types/event-data.ts (new) - TypeScript interfaces for TrackParams, JetParams, CaloClusterParams, etc.
• src/loaders/object-type-registry.ts (new) - ObjectTypeConfig registry and default configs
• src/loaders/phoenix-loader.ts - Replaced 290-line if/else with 60-line registry loop
• src/loaders/event-data-loader.ts - Added types to interface methods
• src/loaders/cms-loader.ts - Uses getObjectTypeConfigs() override instead of overriding loadObjectTypes()
• src/loaders/edm4hep-json-loader.ts - Fixed inverted logic in getRunNumber() / getEventNumber()
• src/event-display.ts - Typed eventsData and related methods
• src/index.ts - Export new types and registry

Testing

• yarn tsc:build --noEmit passes with zero errors
• All 170 existing tests pass
• Manually loaded Phoenix JSON events - all object types render correctly
• Manually loaded EDM4hep JSON - run/event numbers display correctly now
• Verified CMS .ig file loading still works with MuonChambers via registry extension

Notes

Skipped decorator-based registration - adds complexity for minimal benefit. The explicit registry is simpler and easier to debug.

[remo-lab]

Hi @EdwardMoyse ,This PR replaces the 290-line if/else chain in PhoenixLoader with a registry-based approach. Much easier to extend now - experiments can add custom object types without overriding the entire load method.

Also fixed a bug in Edm4hepJsonLoader where getRunNumber() and getEventNumber() were returning the wrong values (inverted null checks).

All tests pass and I manually verified with Phoenix JSON, EDM4hep, and CMS .ig files.would appreciate a review whenever you have time!