docs: add v0.7.0 release notes

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/release-notes/v0.7.0.md

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+# v0.7.0 — The AI Assistant grows up: real chat bubbles, Markdown & a thinking indicator
+
+## ✨ New features
+
+**A proper chat UI for the AI Assistant**
+* The AI Chat pane now renders real chat bubbles — your messages on the right, the AI's on the left — with full **Markdown**: code blocks, tables, lists and inline `code` all display cleanly.
+* When you send a prompt, an animated **"…" thinking bubble** appears while the AI works and disappears the moment the reply lands, so you always know it's running.
+* Built on WebView2 (part of Windows 11). The model dropdown, `[AI]` serial tagging, and PDU confirmations all work exactly as before.
+
+**Control how far the AI runs**
+* New setting **Max tool calls / message** (Settings → AI Assistant): how many tool calls the assistant may chain before it stops — a runaway-loop guard. Default is 30.
+* Set it to **0 for unlimited**, handy for long automation runs you leave going for hours.
+* While the AI is working, the **Send button turns into Stop** so you can abort any run — bounded or unlimited — at any time.
+
+## 📦 Downloads
+
+| Build | Needs .NET Runtime? | Notes |
+|---|---|---|
+| **ETTerms_v0.7.0** (Standard) | ✅ Requires .NET 8 Desktop Runtime | Smaller download |
+| **ETTerms_v0.7.0_portable** (Portable) | ❌ Runtime included | Unzip and run anywhere, no admin |
+
+Run `ETTerms v0.7.0.exe`. (The WebView2 Runtime ships with Windows 11; both builds include the native loader.)
+
+## 🔗 Links
+
+* [Architecture](https://github.com/ETWen/ETTerms/blob/main/ARCHITECTURE.md) — see "Built-in AI Assistant (Phase 10)"
+* [Serial MCP guide](https://github.com/ETWen/ETTerms/blob/main/docs/serial-mcp-guide.md)
+
+**Full changelog:** [v0.6.0...v0.7.0](https://github.com/ETWen/ETTerms/compare/v0.6.0...v0.7.0)