The Slice-0 vertical that proves the enforcement architecture end-to-end.
- kernel: castSpell (slot consumption + concentration set/replace, upcasting,
warlock pact slots), spendResource/regainResource, rollDeathSave — pure
functions returning Partial<Character> patches. 13 unit tests.
- applyRest now ends concentration on any rest (+ test).
- character sheet SpellcastingSection: per-spell Cast button, concentration
banner with Drop, concentration markers; ResourcesSection −/+ routed through
the kernel.
- player MyCharacterPanel: castable spell list + concentration banner, so a
seated player casts and it broadcasts via the existing playerPatch flow.
- live sync: partialCharacterDiffSchema carries concentration; GM applies it;
playerCharacterSchema mirrors slots/concentration/resources (PC-only) and the
player-facing AC now respects equippedArmor. Wire round-trip test added.
Verified live: casting decrements the right slot, switching concentration logs
"Concentration on X ends", banner + Drop render. Build + 258 tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Lay the foundation for full rules enforcement: a new pure, testable
mechanics kernel (src/lib/mechanics/) that derives structured, enforceable
game data from the loosely-typed compendium, plus the first user-facing
payoff (accurate armor AC + spell mechanics on the sheet).
- normalizers: spell (5e + pf2e), armor, monster defenses → typed
SpellMechanics / ArmorMechanics / DamageDefenses, with memoized derivers
wrapping the existing lazy compendium loaders (no new assets). 11 unit tests.
- character schema: spell entries snapshot concentration/save/damage at
compendium-link time; new top-level `concentration` slot and structured
`equippedArmor` (additive, defaulted). Dexie v14 migration backfills.
- AC model: baseArmorClass now consults equippedArmor (heavy = flat, medium =
Dex-capped) and falls back to the old 10+Dex formula when unarmored. Threaded
through every AC call site; armor picker added to the sheet (5e).
- compendium "Add spell to character" snapshots real mechanics via the kernel.
Backward-compatible: un-enriched spells/characters behave exactly as before.
Build + 244 unit tests green; armor→AC verified live in preview.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
NilsBriggen