docs: update readme for resume langfuse callback use

ops: allow resume endpoint use langfuse callback

ops: langfuse callback is optional

docs: readme update for latest changes

fix: same thread requests not clearing auth flag

ops: langfuse integration for observability

fix: change policyrouter to use better thinking model

added mcp tool caching and compacted task executor prompt

added unit test files for task executor and policy router nodes

model init refactor

added concurrency support for io bound benchmark tests

added speed benchmarks, and decoupling fixtures in tests

readme addition for conftest

decoupled test suite from src hitl tools constant

updated readme documentation