[spuentesp]

Summary

Death in Space is no longer built in (RS-1, RS-2). A named game should come from its ingested book, not from code.

• Removes its builtin_systems.json entry, the two hand-written spec modules, the DEATH_IN_SPACE re-export, the name-based tags, and scripts/death_in_space_game_system.py, which seeded it as a builtin. The seeder only inserts, so existing databases keep their record until it is removed by hand.
• The typed-sheet tools (rpg_character_create/update, rpg_validate_sheet) only accepted games with a hand-written class, which meant only Death in Space. They now validate against each system's spec, with the legacy class registry as fallback.
• d20 systems stored as meet_or_beat now map to d20_over, and one whose formula rolls under maps to d20_under. D&D 5e, Mistlands Core and Narrative Weighted were all falling through to custom.
• Tests that used Death in Space to exercise the generic factory and registry now use an invented system (_lantern_drift_spec.py), so their checks are unchanged.

Backtrack undoes what the turn wrote (P-7). It used to rewind only the checkpoint, so an undone turn's entries came back on the next load, its memories stayed searchable, its working-state changes stuck, and its pending proposals could still be accepted into canon.

• New mongodb_rewind_scene removes what the scene wrote after the restore point:

  • turns
  • resolutions
  • proposals
  • memories, plus their Qdrant vectors
  • foreshadowing plants
  • payoffs, which are reopened

  Working state is restored from the earlier checkpoint's copy, or reported when there isn't one.

• As P-7 says, it refuses if the turn had a proposal accepted into canon, and changes nothing. A database failure midway is reported as partly undone. Running /backtrack again finishes it.

• Not undone yet: NPC profile updates the narrator makes during a turn.

Test plan

• New data-layer tests for the rewind, using an in-memory fake, plus a manual run against a throwaway MongoDB 7.0 container
• Scene-loop tests: rewind boundary, vector cleanup, working-state copy, refusal, partial failure
• Full suite: 8,483 passed. 4 failures (test_chat_loops end-scene ×2, test_lorebook_api list/export) also fail on master
• Sealed suites untouched, layer check, ruff
• CI

The paste's _uses_roll_under change was skipped: success_type can't hold a roll-under value, and roll-under is already read from the formula text.

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