stage-14: pytest test suite over the worker lines

38 tests covering the pure worker-line logic: Classifyline rules, Routeline
TLP/country/incident-type gates, Sealine seal/unseal round-trip, Proofline
confidence scoring, Mapline CVEResolver escalation, Trainline dataset
well-posedness (the v1/v3 input-signal bugs are now regression-guarded), and
the Scoutline feed parsers. pytest added as a dev extra.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pyproject.toml

@@ -20,12 +20,18 @@ dependencies = [
     "sqlalchemy>=2.0",
 ]
 
+[project.optional-dependencies]
+dev = ["pytest>=8.0"]
+
 [project.scripts]
 psyc = "psyc.cli:app"
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/psyc"]
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
 [tool.ruff]
 line-length = 120