Remove tach

[teocns]

For a small/medium codebase like AgentOps, tach is probably overkill:

• codebase is relatively small and focused
• The module dependencies are straightforward (event → session, etc.)
• Small team size means architectural decisions can be enforced through code review
• It wasn't providing any meaningful value the way it was configured
• Slows down development unnecessarily

Cases where tach is actually helpful is far from our reality. Let me give some examples:

• Large enterprise codebases with 100k+ lines of code
• Microservices with strict boundaries that must be enforced
• Teams of 10+ developers working across multiple modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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