Phase F.5 (docs portion) of the rule-variants epic.
- PRESET-API.md gains a 'Rule Variants Gallery' section summarizing
the 14 new presets grouped by category (King Variants, Objectives,
Multi-move, Movement). Flags which are scope-aware. Documents
the reusable scope-flip pattern for future asymmetric presets.
New section on 'ongoing' two-phase protocol for
onCheckGameResult composition.
- RULES.md gains a 'Rule Variants Gallery (v2, 2026)' section
cross-referencing each of the 14 presets with greenchess.net
where applicable. Overview table bumps from 15 rules to 29.
Also documents the new 'dual-classic' starting layout.
Tests: 1651 passing (docs-only; no test delta).
(Full Playwright regression + final commit still to come as part
of F.5 once the F.4 e2e spec lands.)
Joey Yakimowich-Payne
ed2f0cc660