Enable strict type checking and resolve pytype workarounds

[manaspros]

Problem

While the codebase uses type hints extensively, type checking is not enforced strictly:

1. Pytype configured with keep_going = true (ignores errors and continues)
2. Active TODO for pytype bug in entity_agent.py:30:

   # TODO: b/313715068 - remove disable once pytype bug is fixed.                                                     
   # pytype: disable=override-error                                                                                   

3. No mypy or strict type checking in CI pipeline
4. Multiple # type: ignore pragmas scattered across codebase
5. Type coverage not tracked or enforced for new code

Current Configuration

pyproject.toml
[tool.pytype]
keep_going = true # ← Continues past errors

This means type errors exist but are silently ignored.

i can work on it too

[BeathovenGala]

Hi @manaspros

I’ve reviewed the Strict Type Checking Enforcement walkthrough and understand the required changes. I’d like to be assigned this issue so I can implement them.

What I plan on doing

~Firstly to disable keep_going in pyproject.toml to enforce strict pytype checks and fail fast on any type error & remove the pytype: disable=override-error suppression in entity_agent.py and adjust the code so it passes under strict checking.

~Fix the signature-mismatch issues in the Engine interface by widening the base next_acting return type to properly support parallel and simultaneous execution engines, and remove the suppressions in the relevant files.

~Run the full pytest suite again to re-ensure no runtime regressions are introduced.