Consolidate review feedback from PRs #26 and #6 into single mergeable changeset

[Copilot]

Multiple open PRs (#26, #6) had unresolved review feedback blocking merge. This consolidates both changesets with all reviewer suggestions applied.

PR #26 — Runtime bug fixes

• stderr redirect: console.log → console.error to avoid corrupting MCP StdioServerTransport stdout. Uses unknown[] not any[].
• Pagination: Wire up lastMentionId as since_id using URLSearchParams instead of string concatenation.
• Response validation: Array.isArray() guard in fetchThread before calling parseThread, preventing crashes on unexpected API shapes.
• Immutable sort: [...tweets].sort() instead of in-place tweets.sort() in parseThread; index signature uses unknown not any.
• Bounded memory: Cap processedMentions Set at 10k with safe iterator pruning:

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

• Chronological ordering: Process mentions via [...newMentions].reverse() (oldest→newest) so Set insertion order matches time order for correct eviction.

PR #6 — Reply targeting

• Add mentionPostId param to analyzeAndDecide() / simulateAnalysis() so replies target the mention post, not the conversation root.
• Replace const data: any with unknown + explicit type cast for Grok API response parsing.

Files changed

src/index.ts, src/services/xapi.ts, src/services/agent.ts, src/services/grok.ts, src/examples.ts

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[groupthinking]

Closing stale draft — superseded by cleanup/ready-to-use merge to main