v1.6.5

Version bump re-triggering the npm and Chrome Web Store deployments. No functional changes since v1.6.4 - this release exists so both deployment pipelines run again cleanly against the final tagged commit (extension manifest version matches the package version).

See v1.6.4 for the full changelog: https://github.com/Quindart-com/opencode-chromium/releases/tag/v1.6.4