docs(#1): SDK integration guide, API reference, and CI pipeline

- Rewrite README with quick start, FastAPI snippet, async/sync patterns,
  config reference with env vars, and API version targeting (v1, schema 1.0)
- Add docs/integration-guide.md with full FastAPI and generic Python
  integration examples, environment-specific config, prediction queries,
  error handling, and dry-run mode documentation
- Add docs/api-reference.md covering all exported classes, methods, Pydantic
  models, enums (TaskType, Complexity, Harness, Provider, QualityGate,
  Outcome, RepoSizeCategory), and internal components
- Add Woodpecker CI pipeline (.woodpecker.yml) with quality gates: lint,
  format check, typecheck, bandit security scan, pip-audit, and pytest
  with 85% coverage gate
- Add bandit and pip-audit to dev dependencies

Fixes #1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -17,6 +17,8 @@ dev = [
     "ruff>=0.14.0",
     "mypy>=1.15",
     "respx>=0.21.0",
+    "bandit>=1.8.0",
+    "pip-audit>=2.7.0",
 ]
 
 [build-system]