Replace ad-hoc logging.basicConfig() calls across all 6 entry points with
a centralized configure_logging() function backed by structlog. JSON output
when stderr is not a TTY (production/Docker), colored console output otherwise.
- New turnstone/core/log.py: configure_logging(), get_logger(), contextvars
for node_id/ws_id/user_id/request_id auto-injected into every log event
- All entry points (server, bridge, console, sim, cli, migrate) call
configure_logging() with --log-level and --log-format CLI flags
- Server operational print() calls replaced with structured log.info()
- LogContextMiddleware sets request_id + ws_id per HTTP request with
token-based reset to prevent context leaking across requests
- Bridge _run_in_context() helper propagates ctx_node_id to child threads
- Env var overrides: TURNSTONE_LOG_LEVEL, TURNSTONE_LOG_FORMAT
- 18 new tests (959 total passing)
Patrick Buckley