feat(game): NAVIGATION AI unlocks two-hop jumps in one action (#35)

lib/openapi.ts

@@ -8,7 +8,7 @@ export const openApiSpec = {
   info: {
     title: 'SpaceWanderer API',
     description:
-      'JSON API for SpaceWanderer — a single-player turn-based space adventure (one save, no accounts). World endpoints: read the generated world state and jump between adjacent solar systems.',
+      'JSON API for SpaceWanderer — a single-player turn-based space adventure (one save, no accounts). World endpoints: read the generated world state and jump between solar systems within range (adjacent by default; two hops once NAVIGATION AI is researched).',
     // Sourced from package.json so it stays in sync with every version bump.
     version: pkg.version,
   },
@@ -52,9 +52,9 @@ export const openApiSpec = {
     },
     '/api/jump': {
       post: {
-        summary: 'Jump to an adjacent solar system',
+        summary: 'Jump to a solar system within range',
         description:
-          'Validates that the target is a jump route away from the current system, sets it as current (discovering it if new and generating its neighbours), increments the turn counter and writes a jump event. Returns the fresh world state.',
+          'Validates that the target is within jump range of the current system — one hop away, or two hops once NAVIGATION AI is researched (#35) — sets it as current (discovering it if new and generating its neighbours), advances the turn counter by the hop count and writes a jump event. Returns the fresh world state.',
         operationId: 'jumpToSystem',
         requestBody: {
           required: true,
@@ -90,7 +90,7 @@ export const openApiSpec = {
             },
           },
           409: {
-            description: 'Target is not adjacent to the current system (or is the current system itself)',
+            description: 'Target is outside jump range of the current system — more than one hop away, or more than two hops without NAVIGATION AI researched (or is the current system itself)',
             content: {
               'application/json': {
                 schema: { $ref: '#/components/schemas/Error' },