Adds the sea ability: a fixed set of 12 named sea zones with sole-control
semantics, contest-by-higher-military, and a deterministic per-turn
+1 military/+1 economy bonus for each claimed zone. Durable (owns
GameState.seaZones), additive migration, stub-inert (e2e unaffected).
Fixes#65
Design note: Gitea #65 sketched a free-form 'naval' layer; the implemented
approved design is this richer 'sea' layer with a fixed zone set.
Add the 9th modular LLM ability: a turn-transient `TurnResult.disasters`
lever letting the LLM declare natural/man-made disasters (earthquake /
flood / volcanic / wildfire / famine / plague / epidemic) on a nation or
a region, applying a DETERMINISTIC (type, severity) stat dip (no hidden
randomness). Like the hybrid layer it owns no GameState field, needs no
db.ts change, and leaves no durable list — an ongoing plague/epidemic is
simply re-declared each turn it persists.
- shared/protocol.ts: DisasterType / DisasterSeverity / DisasterEvent /
DisastersOps, and `TurnResult.disasters` (between `ideology` and
`markers`; required, default `{ events: [] }`).
- server/abilities/disasters.ts: the ability module (validate / apply /
schemaLine / constraint / isMeaningful / inert stub / empty payload; no
stateFields). `DISASTER_EFFECTS` is the deterministic (type, severity)
dip table (population never touched). Target resolution mirrors hybrid
(a region key hits its SOLE owner; 0/2+ owners dropped) but has NO
`from` field, so there is no self-target drop. Dips clamp to 0-100,
mirror to the target's regions (regionStats), and re-derive the target
nation's stats (same 0-region / no-entry guards).
- Registered last in ABILITIES (after ideology). System-prompt goldens
regenerated (one schema line + one constraint bullet each); the
user.txt golden stays byte-identical (payload() is {}).
- New server/abilities/disasters.test.ts (33 tests); registry.test.ts
updated to the 9-ability contract.
- Secondary cleanups from the v0.40 refactor: AGENTS.md (abilities/ in
the Layout tree + a "how to add a new ability" bullet + a disasters
bullet), delete the orphaned validateTakeovers JSDoc, fold both inline
`as unknown` casts into the top-level ./abilities import, and de-dup
`str` (now imported from ./abilities/shared).
Version bumped 0.40.0 -> 0.41.0.
kamilkrzywda