fix: consolidate actionable review feedback from PRs #4, #6, #26

[Copilot]

Addresses unresolved review comments across multiple stale PRs by implementing the suggested fixes in a single changeset.

Reply targeting (PR #6)

• analyzeAndDecide now takes mentionPostId so replies target the mention post, not the thread root

// Before: always replied to root
return this.parseGrokResponse(analysisText, thread.root_post.id);

// After: replies to the actual mention
async analyzeAndDecide(mention: string, thread: XThread, mentionPostId: string)

API response validation (PR #26)

• fetchThread and searchTweets guard with Array.isArray() before passing to parseThread
• fetchMentions URL construction switched to URLSearchParams with since_id support

Type safety (PRs #4, #6, #26)

• Replaced any in parseThread, parseMentions, parsePost signatures with { [key: string]: unknown }
• Grok API response typed as { choices: Array<{ message?: { content?: string } }> } instead of any

Mention processing correctness (PR #26)

• Process mentions oldest-first (reverse iteration) for chronological Set insertion order
• Iterator-based Set pruning (cap 1000) prevents unbounded memory growth

const { value, done } = iter.next();
if (done) break;
this.processedMentions.delete(value);

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[groupthinking]

Closing stale draft — superseded by cleanup/ready-to-use merge to main