docs: add comprehensive AI technical gotchas guide for MCP builders

Analyze GitHub issues (sorted by comments), PRs, and source code to
document key technical challenges for building browser automation MCPs
with AI agents.

Key findings grounded in actual code:
- Token explosion from automatic snapshots in input tools (src/tools/input.ts)
- Error handling patterns learned from crashes (src/main.ts, src/PageCollector.ts)
- WSL2 Chrome discovery issues (src/browser.ts)
- Dual-format output implementation (src/formatters/SnapshotFormatter.ts)
- Accessibility tree limitations from Puppeteer dependency

Sources: Issues ChromeDevTools#131, ChromeDevTools#363, ChromeDevTools#617, ChromeDevTools#635, ChromeDevTools#689, ChromeDevTools#690, ChromeDevTools#709, ChromeDevTools#713, ChromeDevTools#716, ChromeDevTools#726, ChromeDevTools#752
PRs: ChromeDevTools#618, ChromeDevTools#710, ChromeDevTools#744
Commits: f59b4a2, ca0f560, 3fcca02

Author: claude