fix: enforce directory param in skill resolution, replace legacy k2p5 model ID

- Make directory required in SkillLoadOptions, getAllSkills, and async
  skill template resolvers to prevent unsafe process.cwd() fallback
- Remove dead skill export and process.cwd() fallback in skill tool
- Replace kimi-for-coding/k2p5 with kimi-for-coding/kimi-k2.5 in
  council-members-generator

src/tools/delegate-task/skill-resolver.ts

@@ -4,7 +4,7 @@ import { discoverSkills } from "../../features/opencode-skill-loader"
 
 export async function resolveSkillContent(
   skills: string[],
-  options: { gitMasterConfig?: GitMasterConfig; browserProvider?: BrowserAutomationProvider, disabledSkills?: Set<string>, directory?: string }
+  options: { gitMasterConfig?: GitMasterConfig; browserProvider?: BrowserAutomationProvider; disabledSkills?: Set<string>; directory: string }
 ): Promise<{ content: string | undefined; contents: string[]; error: string | null }> {
   if (skills.length === 0) {
     return { content: undefined, contents: [], error: null }