Follow-ups to the salvaged commits in this PR:
* gateway/config.py — strip trailing whitespace from youngDoo's diff
(line 315 had ~140 trailing spaces).
* hermes_cli/tools_config.py — replace `config.get("platform_toolsets", {})`
with `config.get("platform_toolsets") or {}`. Handles the case where the
YAML key is present but explicitly null (parses as None, previously
crashed with AttributeError on the next line's .get(platform)).
Cherry-picked from yyq4193's #9003 with attribution.
* tests/gateway/test_config.py — 4 new tests for TestGetConnectedPlatforms
covering DingTalk via extras, via env vars, disabled, and missing creds.
* tests/hermes_cli/test_tools_config.py — regression test for the null
platform_toolsets edge case.
* scripts/release.py — add kagura-agent, youngDoo, yyq4193 to AUTHOR_MAP.
Co-authored-by: yyq4193 <39405770+yyq4193@users.noreply.github.com>
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