Consolidate actionable review feedback from PRs #26, #6, #4

[Copilot]

Addresses unresolved review comments across open PRs to unblock merges. Implements the 5 runtime bug fixes from PR #26 plus type safety and correctness improvements flagged by reviewers on PRs #6 and #4.

Runtime fixes (PR #26)

• Redirect console.log to stderr — prevents corruption of MCP StdioServerTransport stdout protocol stream
• Wire lastMentionId → since_id via URLSearchParams — eliminates redundant refetches each poll cycle
• Array.isArray() guard before parseThread() / searchTweets — prevents crash on unexpected API response shapes
• [...tweets].sort() in parseThread — avoids mutating caller's array
• Cap processedMentions Set at 10k with oldest-first pruning — prevents unbounded memory growth

Type safety (PRs #26, #6)

• Replace any with Record<string, unknown> in parsePost, parseMentions, searchTweets
• Typed Grok API response: as { choices: Array<{ message?: { content?: string } }> }
• unknown[] for console.log override args
• Safe { value, done } destructure on Set iterator instead of type assertion

Correctness (PR #26 review)

• Process mentions oldest→newest (.reverse()) so Set insertion order matches chronology, ensuring pruning evicts actually-oldest IDs

README (PR #4 review)

• Fix double space, broken list numbering in xAI/Grok section

// Before: fragile string concat, no since_id, no Array.isArray guard
const mentionsResponse = await this.makeXAPIRequest(
  `https://api.twitter.com/2/users/${userId}/mentions?max_results=10&...`, 'GET'
);
return this.parseThread(response.data || []);

// After: URLSearchParams, since_id wired, validated
const params = new URLSearchParams({ max_results: '10', expansions: 'author_id', ... });
if (this.lastMentionId) params.set('since_id', this.lastMentionId);
if (!Array.isArray(response.data)) return null;
return this.parseThread(response.data);

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[groupthinking]

Closing stale draft — superseded by cleanup/ready-to-use merge to main