chore: Added AGENTS.md file

AGENTS.md

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+# CLAUDE.md
+
+This file provides guidance to Agents when working with code in this repository.
+
+## Project Overview
+
+Celeste AI is a type-safe, provider-agnostic SDK for multi-modal AI. It provides a unified interface to 15+ AI providers (OpenAI, Anthropic, Google, Mistral, Ollama, etc.) across multiple modalities (Text, Images, Audio, Video, Embeddings).
+
+**Philosophy:** "Primitives, not frameworks" - clean I/O without lock-in.
+
+## Commands
+
+```bash
+# Dependencies (uses uv package manager)
+make sync              # Update and sync all dependencies
+
+# Quality checks
+make lint              # Ruff linting check
+make lint-fix          # Ruff auto-fix
+make format            # Ruff formatting
+make typecheck         # MyPy type checking
+make security          # Bandit security scan
+make ci                # Full CI pipeline (lint, format, typecheck, security, test)
+
+# Testing
+make test              # Unit tests with coverage (80% minimum)
+make integration-test  # Integration tests (requires API keys)
+
+# Run specific tests
+uv run pytest tests/unit_tests/test_models.py -v
+uv run pytest tests/unit_tests -k "test_name" -v
+```
+
+## Architecture
+
+### Core Design: Modality-First with Provider Multiplexing
+
+The SDK is organized around **what you produce** (modality) and **where it comes from** (provider):
+
+```
+src/celeste/
+├── core.py           # Enums: Provider, Modality, Operation
+├── models.py         # Model registry: register_models(), get_model(), list_models()
+├── client.py         # Base ModalityClient and APIMixin
+├── constraints.py    # Parameter validation (Range, Choice, Pattern, etc.)
+├── parameters.py     # Parameter mapping system
+├── modalities/       # By-modality organization
+│   ├── text/         # client.py, io.py, parameters.py, streaming.py, models.py
+│   ├── images/
+│   ├── audio/
+│   ├── videos/
+│   └── embeddings/
+├── providers/        # By-provider implementations (19 providers)
+│   └── {provider}/{modality}/  # Each has client.py, parameters.py, models.py
+└── namespaces/       # High-level API: celeste.text, celeste.images, etc.
+```
+
+### Key Abstractions
+
+1. **Model Registry** (`models.py`): Central registry mapping `(model_id, provider)` to `Model` objects with capabilities, operations, and parameter constraints.
+
+2. **ModalityClient** (`client.py`): Generic base class `ModalityClient[Input, Output, Parameters, Content]` handling sync/async delegation.
+
+3. **Parameter System** (`parameters.py`, `constraints.py`):
+   - `ParameterMapper`: Transforms provider-specific parameters to unified format
+   - `Constraint`: Validates parameters (Range, Choice, Pattern, Min, Max)
+
+4. **Domain Namespaces** (`namespaces/domains.py`): Entry points supporting:
+   - Async: `celeste.text.generate()`
+   - Sync: `celeste.text.sync.generate()`
+   - Streaming: `celeste.text.stream.generate()`
+
+### Provider Implementation Pattern
+
+```python
+# In providers/{provider}/{modality}/client.py:
+class ProviderTextClient(ProviderMixin, TextClient):
+    async def generate(self, inputs: TextInput, **parameters):
+        request = self._build_request(inputs, parameters)
+        response = await self._make_request(request)
+        return self._parse_response(response)
+```
+
+## Key Conventions
+
+- **Async-first**: Implementations use `async def`, sync versions via `asgiref.sync.async_to_sync()`
+- **Type hints everywhere**: Strict MyPy enforced (`disallow_untyped_defs=true`)
+- **Pydantic v2**: Full validation with IDE autocomplete
+- **Test isolation**: Use `clear_registry` fixture to isolate model registry between tests
+- **Conventional Commits**: `feat(scope):`, `fix:`, `test:`, `docs:`, `refactor:`
+
+## Public API
+
+```python
+from celeste import create_client, Modality, Operation, Provider
+
+# High-level API (preferred)
+text = await celeste.text.generate("prompt", model="claude-opus-4-5")
+image = await celeste.images.generate("prompt", model="flux-2-pro")
+
+# Explicit client creation
+client = create_client(
+    modality=Modality.TEXT,
+    operation=Operation.GENERATE,
+    provider=Provider.ANTHROPIC,
+    model="claude-opus-4-5",
+)
+```
+
+## Testing Notes
+
+- Unit tests: `tests/unit_tests/` - fast, no API calls, 80% coverage minimum
+- Integration tests: `tests/integration_tests/` - require API keys, marked with `@pytest.mark.integration`
+- Use `@pytest.mark.smoke` for critical path tests
+- Use `@pytest.mark.parametrize` for multiple input combinations
+- Tests use `pytest-asyncio` with `asyncio_mode = "auto"`