tool: scenariotest: EDN scenario + play-loop harness

[mparrett]

Summary

• Adds tools/scenariotest.lg + tools/scenariotest/build.lg: load a handcrafted EDN arena (no dungeon gen) and drive it through the real xsofy.play / dispatch loop.
• Ships two visually readable starter scenarios: a 2×2 water pool for Burning while standing in water #162 and a 2/3/2 web patch for Spider webs no longer trampled #161 / PR fix(status): stop generic decay from racing the web struggle branch #166.
• Applies per-creature scenario patches to the exact entity created by ent/spawn, with regression coverage for overlapping positions.
• Sibling of tools/lighttest.lg (isolated TUI), but this one boots the game sim on purpose so turn-order / status / fire paths are faithful.

Run

lg tools/scenariotest.lg                              # default: water-burning
lg tools/scenariotest.lg tools/scenarios/water-burning.edn
lg tools/scenariotest.lg tools/scenarios/web-trample.edn
lg tools/scenariotest.lg --check                      # build-only smoke, no TTY

In the TUI, normal game keys (. wait, movement keys, Esc/Ctrl-C quit). Unhandled menu screens are dismissed in this draft.

Web scenario visibility: ash is tile 16, rendered as a dim gray ., while stone floor is a warmer brown .. The first trampled tile is hidden beneath @ until the player moves away. For an unmistakable local comparison, temporarily change the scenario's :fill from 1 to 2; ash . will then stand out against green grass ".

Test plan

• lg tools/scenariotest.lg --check prints the arena summary and exits 0
• Both bundled scenario paths pass --check
• Headless dispatched wait reproduces Burning while standing in water #162 on main (the water tile ignites and the player gains :burning)
• Two up-left actions reproduce Spider webs no longer trampled #161 on main (player moves through the open corner; center tile 19 remains) and demonstrate PR fix(status): stop generic decay from racing the web struggle branch #166's fix (player stays; center tile becomes 16/ash)
• New overlap regression verifies creature patches target the newly spawned entity
• Existing suite: 300 tests, 2,782 assertions, 0 failures/errors
• Interactive comparisons with the Burning while standing in water #162 and fix(status): stop generic decay from racing the web struggle branch #166 fixes

Made with Cursor

[nnunley]

I wonder if this is an indication that we should have a struct or type defined to represent world state, since this sort of empty initialization should be already set up on the default base world state.

[nnunley]

It does look like there's some common code that should be extracted to avoid duplication and risks of having replicated state, particularly at the base of the world state initialization. That said, this is still non-blocking.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-23 00:29 UTC