Fix type safety in work.ts

[tembo]

Summary

Improved type safety by replacing any types with proper LLMService interface in work.ts functions. Added parentTweetForContext property to the Tweet interface to eliminate unsafe type casts in reply.ts.

Changes:

• Updated generateBlogDraft() and updateRelatedBlogPosts() function parameters from llm: any to llm: LLMService
• Added parentTweetForContext?: Tweet property to Tweet interface in x-api.ts
• Removed as any type casts in reply.ts (lines 269, 462)
• Added corresponding task to .beads/issues.jsonl

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[tembo]

Requesting review from @ryw who has experience with the following files modified in this PR:

• .beads/issues.jsonl
• src/commands/work.ts
• src/commands/reply.ts
• src/services/x-api.ts