Write 'Mirror Node Queries' (evm/integrations/indexing/mirror-node)

**Page:** `evm/integrations/indexing/mirror-node.mdx`

**Scope:** Query historical contract data via the Mirror Node REST API for EVM devs — logs, contract results, state. Examples.

⚠️ **Check before writing:** confirm this does not duplicate `evm/development/archive-queries`; differentiate scope or cross-link.

### Acceptance criteria
- [ ] Replace the placeholder template with real content
- [ ] Remove `hidden: true` from the frontmatter
- [ ] Follow the style guide: **markdown tables only** (no HTML ``), and avoid AI-tell phrasing (no em-dashes, "delve", "leverage", "not just X but Y")
- [ ] Add working cross-links to related pages
- [ ] Confirm any code samples run on testnet