Initial version of stealthii

An aiohttp/httpx-shaped async HTTP client backed by a single, persistent,
stealth-patched Chromium instance via Playwright. get/post/put/patch/
delete/head/download use context.request (real Chrome TLS/HTTP2
fingerprint, no tab needed); render()/screenshot()/page() escalate to
full JS-executing page rendering for targets that need a JS challenge
solved. Supports named sessions for cookie persistence/warm-up, and
`async with stealth as page` to claim a tab directly, task-safe for
concurrent use on one shared instance. Context/browser recycling bounds
cookie and on-disk cache growth in a long-lived process.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0116i7dYLNZTXNR7Lqf439bV

Makefile

@@ -0,0 +1,32 @@
+.PHONY: install dev test test-unit lint format clean build uninstall
+
+install:
+	pip install -e ".[test]"
+	playwright install chromium
+
+dev:
+	pip install -e ".[test]"
+	playwright install chromium
+
+test: test-unit
+
+test-unit:
+	pytest tests/ -v -m 'not online'
+
+test-integration:
+	pytest tests/ -v -m online
+
+lint:
+	ruff check stealthii tests
+
+format:
+	ruff format stealthii tests
+
+clean:
+	rm -rf __pycache__ *.egg-info dist build .eggs stealthii/__pycache__ tests/__pycache__ .pytest_cache .ruff_cache
+
+build:
+	python -m build
+
+uninstall:
+	pip uninstall -y stealthii