fix: make dispatch_key fire legacy keyCode handlers and tighten execute_js IIFE wrap (#9)

- browser_dispatch_key now sets keyCode/which on the synthesized KeyboardEvent
  (both ref and selector paths) so handlers checking e.keyCode === 13 fire.
- browser_execute_js IIFE auto-wrap triggers only when the source starts with a
  return statement, not on any substring "return " (which silently produced
  undefined for bare expressions).
- browser_fill guidelines point at dispatch_key for tag-input submission and the
  snapshot+click recipe for custom dropdowns.

Bump to 0.8.1.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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