fix(cli): clear Feishu home channel when setup prompt left blank (#12423)

[0x003600x]

Problem

Interactive Feishu / Lark gateway setup (_setup_feishu() in hermes_cli/gateway.py) only called save_env_value("FEISHU_HOME_CHANNEL", ...) when the user entered a non-empty home chat ID. Leaving the prompt blank kept any previously saved value in ~/.hermes/.env, so users could not clear an optional home channel during reconfiguration (reported in #12423).

Changes

• After the optional home-chat prompt, trim input; if non-empty, persist with save_env_value as before.
• If blank, call remove_env_value("FEISHU_HOME_CHANNEL") so the key is dropped from persisted env.
• Emit a short print_info line stating that an empty answer clears a previously saved home channel.
• On successful removal, print_success(" Home channel cleared.").

Tests

• Extend _run_setup_feishu mocks to record remove_env_value calls.
• Add TestSetupFeishuHomeChannel: blank removes existing key, blank without prior key still invokes remove once, non-empty saves and does not remove.
• Adapter integration tests: coerce setup result to a plain dict; inject HERMES_HOME under patch.dict(..., clear=True) so adapter init does not rely on Path.home() with an emptied environment.

Verification

python -m pytest tests/gateway/test_setup_feishu.py -q -o addopts=

[DavidMetcalfe]

Thanks for putting this together — the fix approach is correct. However, this PR targets hermes_cli/gateway.py, which no longer contains the setup function. It was moved to plugins/platforms/feishu/adapter.py::interactive_setup during the bundled-plugins refactor.

#58421 supersedes this PR — it targets the current file location and also fixes the same pattern across Discord, Slack, Mattermost, and WhatsApp (which all had the identical bug). It includes the whitespace-stripping, UX hint, and test coverage that were flagged in review here.

Recommend closing this one in favor of #58421.

[teknium1]

Thanks for the focused regression coverage. The underlying behavior is still present on current main, but this PR now targets a removed setup surface.

Problems

• hermes_cli/gateway.py:5691-5692 states that _setup_feishu moved to plugins/platforms/feishu/adapter.py::interactive_setup; the active prompt still preserves a prior value on blank input at plugins/platforms/feishu/adapter.py:5606-5609.
• The submitted test changes patch/import the legacy hermes_cli.gateway setup function, while current tests invoke the plugin setup function and patch its lazy imports at tests/gateway/test_setup_feishu.py:42-55.

Suggested changes

• Port the clearing logic and tests to plugins/platforms/feishu/adapter.py::interactive_setup and the current plugin-based test helper.
• The linked fix(platforms): clear home channel when setup prompt left blank (#12423) #58421 covers the same active Feishu path plus sibling platform setup flows; it remains open, so it is not evidence that this behavior is already implemented.

Automated hermes-sweeper review.