The pino transports run in a worker thread reached through a message
port that stays referenced once a log line is in flight, so the
node:test child process kept running after every test and hook had
finished. The runner then canceled the file's root test with
"Promise resolution is still pending but the event loop has already
resolved" and the suite hung until something killed it, which
happened in roughly two runs out of five.
`logTransportTargets` returns no targets inside a node:test child
process, which `node --test` marks with `NODE_TEST_CONTEXT`, so
tests log straight to stdout and the process exit is deterministic.
Production still uses the console, file, and Loki transports.
AI-assisted-by: step-5-preview-free
* ✨ Improve MCP server logging
Log only fingerprints of user tokens
* ✨ Add Loki transport support to MCP server logger
Loki logging is enabled iff PENPOT_LOGGERS_LOKI_URI is non-empty.
File logging is now enabled iff PENPOT_MCP_LOG_DIR is set to a non-empty value
(previously defaulted to the "logs" directory when unset).
GitHub #9415
