feat!: v0.2.0 — PyPI-ready, interception tests, strict linting

PyPI-ready metadata (donglora-mux), full classifiers, URLs.
Fixed dependency path to client-py. Added 11 interception tests
ported from the Rust mux (SetConfig locking, StartRx/StopRx
refcounting). GitHub Actions CI. Strict ruff linting.

Applied contextlib.suppress per SIM105, collapsed nested ifs per
SIM102.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -0,0 +1,25 @@
+# Changelog
+
+## 0.2.0 — 2026-04-08
+
+### Features
+
+- **PyPI-ready metadata** — full classifiers, URLs, keywords, readme. Publishable
+  as `donglora-mux`.
+- **Interception test suite** — 11 tests ported from the Rust mux covering
+  SetConfig locking, StartRx/StopRx reference counting, and passthrough
+  behaviour.
+- **GitHub Actions CI** — ruff lint + format, pytest on Python 3.10–3.13, PyPI
+  publish on tag.
+- **Strict ruff linting** — E, W, F, I, UP, B, C4, ARG, SIM, RUF rules.
+
+### Fixes
+
+- Fixed broken dependency path (`../../clients/python` → `../client-py`).
+- Fixed dependency name (`donglora-python` → `donglora`).
+- Applied `contextlib.suppress` where ruff/SIM105 flagged try-except-pass.
+- Collapsed nested `if` per ruff/SIM102.
+
+## 0.1.0 — 2026-04-06
+
+Initial release.