Add a deterministic authoring tool that turns a structured scenario
markdown file into a validated scenario-data module:
- tools/scenario-md.js: pure parseScenarioMarkdown + emitScenarioModule
(frontmatter → meta; ## Timeline/## Clues/## Cast lists → the arrays;
auto-slugged ids; validated via validateScenario before emit).
- tools/md-to-scenario.mjs: CLI (npm run gen:scenario), file or stdout.
- tools/example-scenario.md: documented format example.
Parses a defined format, not freeform con prose. tools/ is dev-only and
never bundled. tests/tools/scenario-md.test.js round-trips + validates.
187 tests pass; build clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
