Python: Make lab pyright-only on source (drop source mypy)

Lab was the last package still running mypy on its source code, requiring
mypy-only `# type: ignore` comments that pyright (the sole source checker
everywhere else) flags as unnecessary. Align lab with the rest of the
monorepo:

- Remove the lab source mypy poe tasks (mypy-gaia/lightning/tau2) and the
  now-dead strict [tool.mypy] config block.
- Drop the 'Run lab mypy' CI step; lab source is type-checked by pyright only.

Lab tests remain covered by the workspace test-typing fan-out (mypy, pyrefly,
ty, zuban, pyright over tests using the relaxed root config).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: eavanvalkenburg

.github/workflows/python-lab-tests.yml

@@ -92,9 +92,6 @@ jobs:
       - name: Run lab type checking
         run: cd packages/lab && uv run poe pyright
 
-      - name: Run lab mypy
-        run: cd packages/lab && uv run poe mypy
-
       # Surface failing tests
       - name: Surface failing tests
         if: always()

python/packages/lab/pyproject.toml

@@ -126,43 +126,13 @@ extends = "../../pyproject.toml"
 include = ["gaia/agent_framework_lab_gaia", "lightning/agent_framework_lab_lightning", "tau2/agent_framework_lab_tau2"]
 exclude = ['gaia/tests', 'lightning/tests', 'tau2/tests', 'namespace', '**/samples']
 
-[tool.mypy]
-plugins = ['pydantic.mypy']
-strict = true
-python_version = "3.10"
-ignore_missing_imports = true
-disallow_untyped_defs = true
-no_implicit_optional = true
-check_untyped_defs = true
-warn_return_any = true
-show_error_codes = true
-warn_unused_ignores = false
-disallow_incomplete_defs = true
-disallow_untyped_decorators = true
-
 [tool.bandit]
 targets = ["agent_framework_lab_gaia", "agent_framework_lab_lightning", "agent_framework_lab_tau2"]
 exclude_dirs = ["gaia/tests", "lightning/tests", "tau2/tests"]
 
 [tool.poe]
 include = "../../shared_tasks.toml"
 
-[tool.poe.tasks.mypy-gaia]
-help = "Run MyPy for the lab GAIA package."
-cmd = "mypy --config-file $POE_ROOT/pyproject.toml gaia/agent_framework_lab_gaia"
-
-[tool.poe.tasks.mypy-lightning]
-help = "Run MyPy for the lab Lightning package."
-cmd = "mypy --config-file $POE_ROOT/pyproject.toml lightning/agent_framework_lab_lightning"
-
-[tool.poe.tasks.mypy-tau2]
-help = "Run MyPy for the lab Tau2 package."
-cmd = "mypy --config-file $POE_ROOT/pyproject.toml tau2/agent_framework_lab_tau2"
-
-[tool.poe.tasks.mypy]
-help = "Run MyPy across all lab subpackages."
-sequence = ["mypy-gaia", "mypy-lightning", "mypy-tau2"]
-
 [tool.poe.tasks.test]
 help = "Run the default lab unit test suite."
 cmd = 'pytest -m "not integration and not resource_intensive" --cov-report=term-missing:skip-covered --junitxml=test-results.xml'