feat: Star Search Agents refactor

[jpmcb]

Description

This is a big refactor which re-organizes the StarSearch code and introduces the "agents" concept. Now, there is a "manager" agent that has access to smaller, specialized agents. This is in service of keeping the main system prompt lean and not having a ton of "if / else / if / else" in the prompt (which can confuse the LLM producing worse results.

See inline comments for more details.

Related Tickets & Documents

N/a - ongoing star search work.

Mobile & Desktop Screenshots/Recordings

Steps to QA

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [x] Tier 4