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- New DumpParticlesCommand utility: enumerates loaded ParticleSystem asset-ids via ParticleSystem.getAssetMap().getAssetMap().keySet(). - Wired in GravityFlipPlugin.start() behind GRAVITYFLIP_DUMP_PARTICLES env var (or -Dgravityflip.dumpParticles sysprop). No-op when unset. - Boot-time fallback approach (plan-allowed) -- proper CommandBase registration deferred to avoid i18n translation-key plumbing for a one-shot discovery dump. - See .planning/phases/03-gravity-physics/03-06-DUMP-NOTES.md for trigger instructions and the user checkpoint before Task 3.