Credit AI-assisted documentation and tooling (OpenCode / Qwen3.8 Flash Next)

Add an Acknowledgements section to the README and a matching CHANGELOG line
noting that the v1.0.0 documentation and repository tooling were drafted with
OpenCode running the Qwen3.8 Flash Next model, reviewed by the maintainer.

CHANGELOG.md

@@ -27,6 +27,9 @@ First public release of the ESP32-C3 CO₂ & environment sensor board (prototype
   and docs (`LICENSE.MIT`).
 - `.gitignore` covering KiCad local history/backups/lock files, ESPHome build
   artifacts, live firmware credentials, and OS/editor noise.
+- Documentation and repository tooling for this release (README, changelog,
+  library tables, `.gitignore`, release packaging) drafted with OpenCode running
+  the Qwen3.8 Flash Next model, reviewed by the maintainer.
 
 ### Known issues