Implements all unresolved review comments from PR #26 (Fix 5 runtime bugs) to move it toward merge-ready state.

Type safety

• src/index.ts: any[] → unknown[] in console.log stderr redirect
• src/services/grok.ts: data: any → typed assertion for Grok API response shape

URL construction

• src/services/xapi.ts: Replace fragile string concatenation with URLSearchParams for mentions endpoint

Runtime validation

• src/services/xapi.ts: Add Array.isArray() guard in fetchThread() before parseThread() — prevents crash when API returns non-array data

Iterator safety & pruning correctness

• src/services/agent.ts: Replace iter.next().value as string with destructured { value, done } pattern
• src/services/agent.ts: Reverse mention processing order to oldest-first so Set insertion is chronological and pruning evicts oldest entries, not newest

// Before: unsafe assertion, wrong eviction order
this.processedMentions.delete(iter.next().value as string);

// After: type-safe, chronological
const { value, done } = iter.next();
if (done) break;
this.processedMentions.delete(value);

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