v0.16.0

Added

• Added selection-scoped insert_text to ACL suites, persistent agent CLI
  sessions, the typed action JSON contract, and the standalone Web driver. It
  inserts at the browser's current caret or replaces the current selection
  without refocusing a target.
• Added real standalone-browser coverage that focuses a semantic form field,
  creates a keyboard selection, replaces it through insert_text, and proves
  the submitted value end to end on macOS and Windows CI.

Fixed

• Accepted the current standalone browser's top-level and nested visibility
  response envelopes without weakening typed boolean admission.

Safety

• insert_text uses the existing typed text-input policy capability and
  provenance redaction. It carries no target or locator authority and can only
  affect the editing context explicitly established by an earlier browser
  action.

Changed

• Advanced the action protocol revision to 7 and raised the Rust workspace
  release to 0.16.0. The unchanged Test Kit remains 0.3.0.