fix(audit)+test: deadlock fix + lifecycle test + pytest-asyncio

AuditLog deadlock: log() held self._lock and called _open() which called
close() which tried to acquire self._lock again — RLock not needed,
refactored to _close_locked() (called while already holding lock).

pyproject.toml: pytest-asyncio + httpx in dev deps.

test_main.py:
- lifecycle integration test (MUST-HAVE): IDLE→ARMED→PRIMED→auto-poll
  starts→FIRE→auto-poll stops, asserts scheduler event order
- asyncio import for async test marker

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -24,6 +24,8 @@ windows = [
 dev = [
     "pytest>=8.0",
     "pytest-cov>=5.0",
+    "pytest-asyncio>=0.23",
+    "httpx>=0.27",
 ]
 
 [project.scripts]