Conversation tags feature

[JeanMertz]

We should introduce the concept of "tags" attached to conversations.

These tags will serve multiple purposes in the future (for which separate tracking issues will be created).

• tag-based conversation searching
• tag-based conversation management
• tag-based long-term memory system
• tag-based automation (add context X for any conversation with tag A, etc)
• tag-based agentic workflows (force MCP-based test runs for any workflow with tag X)
• etc...

To start, I think we should do two things, very similar to the existing conversation titles system:

• Add tags to Conversation
• I think we'll want key/value based tags, but support keyless tags by setting the key to an empty string.
• Show list of tags in jp conversation show and jp conversation ls
• Allow adding tags through jp conversation edit
• Auto-add tags to conversations using an LLM call (can be turned off) through our task-system already implemented in feat(conversation): automated title generation #18.