fix(nix): load google_chat platform under Nix

[milanglacier]

Problem

When starting hermes gateway under nix, get this warning:

WARNING hermes_cli.plugins: Failed to load plugin 'google_chat-platform': 'google_chat' is not a valid Platform

Summary

• honor HERMES_BUNDLED_PLUGINS when scanning bundled gateway platform plugins
• allow Platform("google_chat") to resolve before the Google Chat adapter imports under Nix packaging
• keep the existing repo-relative plugins/platforms fallback for development checkouts

Verification

• .venv/bin/python direct regression check for a Nix-like HERMES_BUNDLED_PLUGINS plugin tree

[teknium1]

Thanks for the targeted Nix fix. I verified the premise against the current checkout: gateway/config.py:217 still scans only the repo-relative plugins/platforms path, while hermes_cli/plugins.py:55-65 and nix/hermes-agent.nix:180 already use HERMES_BUNDLED_PLUGINS for bundled plugin discovery. The failure path is also real: plugins/platforms/google_chat/adapter.py:119 imports Platform and plugins/platforms/google_chat/adapter.py:129 calls Platform("google_chat") during plugin import, and hermes_cli/plugins.py:1589-1593 logs the reported “Failed to load plugin” warning when import raises.

Problems

• No regression test is included for the new packaged-path branch: gh pr diff 27077 --name-only shows only gateway/config.py, so CI would not guard HERMES_BUNDLED_PLUGINS platform discovery.

Suggested changes

• Add a focused test near tests/gateway/test_google_chat.py:25-28 or a gateway config test that sets HERMES_BUNDLED_PLUGINS to a temporary plugins/platforms/google_chat tree, resets the Platform bundled-name cache, and asserts Platform("google_chat") resolves before adapter registration.

This is an automated hermes-sweeper review.

[teknium1]

Thanks for the focused Nix packaging fix. The premise still holds on current main: gateway/config.py:290-308 scans only the repository-relative plugins/platforms, while the Nix wrapper exports the installed tree through HERMES_BUNDLED_PLUGINS at nix/hermes-agent.nix:166-180. The proposed resolution matches the established loader behavior in hermes_cli/plugins.py:55-65.

Problems

• The PR changes the dynamic-enum discovery path without a regression test. tests/gateway/test_google_chat.py:23-28 resolves Platform("google_chat"), but does not exercise a Nix-style HERMES_BUNDLED_PLUGINS directory or reset the scanner cache.

Suggested changes

• Add a focused test using a temporary plugins/platforms/google_chat manifest tree, set HERMES_BUNDLED_PLUGINS, clear _Platform__bundled_plugin_names, and assert Platform("google_chat") resolves before adapter import. Cover the unset override retaining repository-relative discovery as well.

This is an automated hermes-sweeper review.

[teknium1]

Please add a regression test for this packaged-path branch: create a temporary plugins/platforms/google_chat manifest tree, set HERMES_BUNDLED_PLUGINS, reset the module-level bundled-name cache, and assert Platform("google_chat") resolves before adapter import.