fix(cooking): correct pump fee-share provider values

The pump_fee_share_list `provider` field rejected "wallet" with
"unknown provider: wallet". Valid values are solana / twitter / github.

- OpenApiClient: update PumpFeeShareInfo provider comment
- SKILL.md / cli-usage.md: provider enum solana / twitter / github,
  username is a SOL address when provider = solana

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/client/OpenApiClient.ts

@@ -171,8 +171,8 @@ export interface TokenSignalGroup {
 }
 
 export interface PumpFeeShareInfo {
-  provider: string;       // "github" | "wallet"
-  username: string;       // username for github; a SOL address when wallet
+  provider: string;       // "solana" | "twitter" | "github"
+  username: string;       // platform username; a SOL address when provider = "solana"
   basic_points: number;
 }