feat(discord): support AI-generated auto-thread names

[lyrabot2000]

Summary

• add discord.thread_naming config with first_message (default) and ai modes
• use Hermes title generator to produce Discord auto-thread names when mode is ai
• keep robust fallback to first-message naming when AI generation fails
• preserve existing mention-stripping behavior for readable thread names

Testing

• python -m pytest tests/e2e/test_discord_adapter.py -q
• python -m pytest tests/hermes_cli/test_config.py -q

Notes

Default behavior is unchanged (first_message). Set discord.thread_naming: ai to enable AI naming.

[alt-glitch]

Likely duplicate of #15757 and #13915 — same feature (AI-generated Discord thread names). Also overlaps with #3009.

[teknium1]

Thanks for the contribution. This is now implemented on current main through a later, guarded Discord auto-thread title flow.

• Automated hermes-sweeper review verified that 0d9ed9214d (Add semantic titles for Discord auto-threads, shipped in v2026.7.7) records the initial placeholder name and routes newly created Discord threads through the existing LLM session-title generator.
• gateway/run.py:19021-19026 supplies the generated title callback, and gateway/run.py:13551-13572 renames only the Hermes-created auto-thread.
• plugins/platforms/discord/adapter.py:5317-5325 retains the first-message title at creation time, then documents semantic LLM naming after the first agent turn. plugins/platforms/discord/adapter.py:5401-5405 prevents overwriting human-renamed or pre-existing threads.
• This also resolves the overlapping feature area noted in the prior discussion around feat(gateway/discord): sync thread names with session titles #15757, feat(discord): add opt-in smart auto-retitling for threads #13915, and feat(discord): generate auto-thread titles #3009.