v0.2: thin httpx2 wrapper rewrite

CLAUDE.md

@@ -4,11 +4,11 @@ Guidance for AI agents (Claude Code, etc.) working in this repository.
 
 ## Project Overview
 
-`httpware` is a Python async HTTP client framework for building resilient service clients. It supersedes `community-of-python/base-client` and ships under the `modern-python` org. The framework owns the abstraction layer above the underlying HTTP client (`httpx2` by default); consumers never import the transport.
+`httpware` is a Python async HTTP client framework for building resilient service clients. It supersedes `community-of-python/base-client` and ships under the `modern-python` org. The framework is a thin opinionated wrapper around `httpx2`: it re-exports `httpx2.Request`/`httpx2.Response`, adds a middleware chain, typed response decoding, and a status-keyed exception tree raised automatically on 4xx/5xx.
 
 **Where to find what:**
 
-- [`docs/dev/engineering.md`](docs/dev/engineering.md) — the distilled design reference: invariants and *why*, the five protocol seams, exception contract, module layout, testing patterns, optional-extras pattern, remaining roadmap. Read this before adding any new module or extension point.
+- [`planning/engineering.md`](planning/engineering.md) — the distilled design reference: invariants and *why*, the three protocol seams, exception contract, module layout, testing patterns, optional-extras pattern, remaining roadmap. Read this before adding any new module or extension point.
 - [`planning/deferred-work.md`](planning/deferred-work.md) — review-surfaced items that are real but not actionable now.
 - [`planning/specs/`](planning/specs/) and [`planning/plans/`](planning/plans/) — per-feature design specs and implementation plans (active work).
 
@@ -44,59 +44,50 @@ uv run pytest
 
 These are non-negotiable. CI rejects PRs that violate them.
 
-- **No `httpx2` leakage**: `import httpx2` / `from httpx2` is allowed ONLY inside `src/httpware/transports/httpx2.py`. The mapping of `httpx2` exceptions to `httpware` exceptions happens at that single seam.
-- **No `httpx2` private API**: `grep -rE 'httpx2\._' src/httpware/` must return zero matches.
+- **No `httpx2` private API**: `grep -rE 'httpx2\._' src/httpware/` must return zero matches. Public symbols only.
 - **No `from __future__ import annotations`**: Python 3.11+ floor; PEP 604/585 syntax is native.
 - **No `print()`**: enforced by ruff.
 - **No global logging config**: no `logging.basicConfig()`, no bare `logging.getLogger()`. Acquire `logging.getLogger("httpware")` or `logging.getLogger(f"httpware.{module}")` only.
 - **Type suppressions**: use `# ty: ignore[<rule>]`, never `# type: ignore` or `# mypy: ignore`.
 
 ## Code conventions
 
-- **Modules**: `snake_case` (`client.py`, `request.py`, `transports/httpx2.py`).
-- **Classes**: `PascalCase`. `Http` is two letters: `Httpx2Transport`, not `HTTPX2Transport`.
+- **Modules**: `snake_case` (`client.py`, `errors.py`, `middleware/chain.py`).
+- **Classes**: `PascalCase`. `Http` is two letters: `AsyncClient`, not `ASYNCClient`.
 - **Methods**: `snake_case`. No `a` prefix on async methods (match `httpx2`); `aclose()` is the sole exception.
 - **Private symbols**: `_leading_underscore`. Cross-module private code lives in `_internal/`.
 - **Imports**: absolute paths inside `src/httpware/`; relative imports only within the same subpackage.
 - **Docstrings**: PEP 257. Module/class/public-method required; `D1` (missing docstring) is ignored.
-- **Exception construction**: keyword arguments only. Mandatory fields: `status: int`, `body: bytes`, `headers: Mapping`, `json: Any | None`, `request_method: str`, `request_url: str`.
+- **Exception construction**: status-keyed errors take a single positional `response: httpx2.Response`. Subclasses do not override `__init__`. All fields available via `exc.response.*`.
 
 ## Module layout
 
 ```
 src/httpware/
 ├── __init__.py                    # public exports + __all__
-├── client.py                      # AsyncClient
-├── request.py                     # Request + with_*
-├── response.py                    # Response, StreamResponse
-├── errors.py                      # status-keyed exception hierarchy
-├── config.py                      # Limits, Timeout, ClientConfig, Redactor
-├── middleware/                    # protocols + built-in middleware
-├── transports/                    # Transport protocol + Httpx2Transport + RecordedTransport
-├── decoders/                      # ResponseDecoder protocol + adapters
+├── client.py                      # AsyncClient (thin wrapper over httpx2.AsyncClient)
+├── errors.py                      # status-keyed exception hierarchy holding httpx2.Response
+├── middleware/                    # protocol, Next type, chain composition, phase decorators
+├── decoders/                      # ResponseDecoder protocol + Pydantic/msgspec adapters
 ├── _internal/                     # private cross-module helpers
 └── py.typed
 ```
 
-Story 1.1 ships only the scaffold; subsequent stories add modules.
-
 ## Protocol seams
 
-Five documented internal boundaries. AI agents must respect them — never cross a seam except through its documented protocol.
+Three documented internal boundaries. AI agents must respect them — never cross a seam except through its documented protocol.
 
-1. **`Middleware ↔ Transport`** — chain bottom calls `transport.__call__`.
-2. **`AsyncClient ↔ Middleware`** — chain composed at construction.
-3. **`AsyncClient ↔ ResponseDecoder`** — called when `response_model` provided.
-4. **`Httpx2Transport ↔ httpx2`** — only `transports/httpx2.py` imports `httpx2`.
-5. **`httpware ↔ optional extras`** — extras imported only inside their dedicated modules.
+1. **`AsyncClient ↔ Middleware`** — middleware chain composed at `AsyncClient.__init__`, frozen for the client's lifetime. Internal terminal calls `httpx2.AsyncClient.send`, maps exceptions, raises `StatusError` on 4xx/5xx.
+2. **`AsyncClient ↔ ResponseDecoder`** — called when `response_model` is provided. Signature: `decode(content: bytes, model: type[T]) -> T`.
+3. **`httpware ↔ optional extras`** — each opt-in dependency imported only inside its dedicated module.
 
 ## Testing
 
 - `pytest-asyncio` auto mode — async tests do NOT need `@pytest.mark.asyncio`.
 - Property-based tests (Hypothesis) for concurrency-sensitive code: `RetryBudget`, `Bulkhead`, retry interleaving. Files named `test_*_props.py`.
-- Tests for transport-level mocking use `RecordedTransport` (shipped with the library); not `respx`.
+- Tests inject `httpx2.MockTransport` via `AsyncClient(httpx2_client=httpx2.AsyncClient(transport=mock))`. No `respx`, no `RecordedTransport`.
 
 ## When in doubt
 
-- Check [`docs/dev/engineering.md`](docs/dev/engineering.md) before adding a new module or extension point.
+- Check [`planning/engineering.md`](planning/engineering.md) before adding a new module or extension point.
 - Surface ambiguity as a documentation gap rather than improvising.