project setup: pyproject.toml, deps, tooling

Configure Python project with pydantic, structlog, typer, rich dependencies.
Set up ruff, mypy, pytest tooling with strict type checking.

readme.md

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+# Veritext
+
+Semantic text validation framework for Python.
+
+Validates text outputs against quality criteria using metrics like BLEU, ROUGE,
+and semantic similarity. Designed for developers building systems that produce
+text (chatbots, content generators, summarisation tools) who need automated
+quality assurance beyond simple string matching.
+
+## Status
+
+Under active development. See [changelog.md](changelog.md) for progress.
+
+## Installation
+
+```bash
+pip install veritext
+
+# With semantic similarity support
+pip install veritext[semantic]
+```
+
+## Quick Start
+
+```python
+from veritext import validators as v
+from veritext.core.types import ValidationContext
+
+# Create validators
+validator = v.all_of([
+    v.bleu(min_score=0.7),
+    v.length(max_chars=500),
+])
+
+# Validate text
+context = ValidationContext(reference="The cat sat on the mat.")
+result = validator.check("A cat is sitting on the mat.", context)
+
+if not result.passed:
+    print(result.failure_summary)
+```
+
+## Documentation
+
+- [Project Plan](docs/project-plan.md)
+- [Implementation Plan](docs/implementation-plan.md)
+
+## Licence
+
+MIT