spike: TypeScriptToLua output on piccolo (wasm32) — Tier-2 authoring gate #96

Spike, offline only. Spec: the packages-devx design, §Runtime scripts (public proposal: #1; the full design doc lives in the private working origin); prior engine spikes: the Lua-scripting research notes §5 (private working origin — piccolo builds on wasm32-unknown-unknown with the getrandom workaround recorded there).

Question: does TypeScriptToLua output actually run on piccolo? TSTL's generated code leans on its lualib runtime support (class machinery, array/string helpers) and assumes a reasonable Lua stdlib; piccolo's stdlib is explicitly incomplete. This is load-bearing for the "author runtime scripts in TS, execute as Lua" decision — run it before any Tier-2 host work.

Scope: scratch crate (session sandbox, same recipe as the 2026-07-02 spikes), piccolo pinned, TSTL targeting Lua 5.4. Transpile a representative script (classes, closures, array methods, string ops, a hook-handler shape) and execute it under piccolo with fuel metering on.

Done when: the representative TSTL-generated script executes correctly under piccolo in the spike harness, OR the exact incompatibilities (missing stdlib fns, lualib assumptions) are enumerated with a shim-size estimate — findings appended to the Lua-scripting research notes (private working origin) either way.

Migrated 2026-08-11 from the private tracker (spacetime-core#508).