Collects power events, QEMU stderr, and firmware serial output. Bounded and in
memory on purpose: an unbounded buffer in a long-running server is a slow leak,
and anyone wanting a permanent record can redirect the server's stderr.
Entries carry a monotonic seq so a polling client can ask for "anything after N"
and receive each line exactly once, including after eviction has dropped older
entries -- a test covers that case specifically, since an index-based cursor would
silently repeat or skip lines there.
Stream decoding is lenient: serial bytes can be garbage before the firmware
configures the port, and losing the stream to one bad byte would be worse than a
replacement character.
