Runtime lookup for the tunable limits that govern orchestration, workers, and the web run record.

These started as module attributes chosen against one local model. Every time a different model was tried — a smaller context, a chattier planner, a slower delegator — the numbers had to be edited in source and the app recompiled. They are now config keys whose defaults are the original attributes, so nothing changes for a host that configures nothing.

Each namespace maps to one application-config entry:

config :ex_athena, :orchestrate,
  max_planning_turns: 12,
  max_turns_without_spawn: 3

config :ex_athena, :agents, result_chars: 32_000
config :ex_athena, :web, agent_prompt_chars: 4_000
config :ex_athena, :bash, max_output_chars: 24_000

A namespace accepts a keyword list (what config.exs produces) or a map (what runtime-assembled config produces).

Why not Compactor.Config

That module resolves with ||, so a configured 0 or false falls through to the default. Its keys are sizes and prompts where that is harmless. These keys are counts and caps where 0 is a meaningful setting — max_turns_without_spawn: 0 means "delegate immediately" — so resolution here is presence-based via Keyword.get/3 and Map.get/3.