`hermes logs --since` and `--level` passed every line that had no leading
timestamp. A traceback's frames are written without one, so an old error
printed its frames without the header that was filtered out, and
`--component` dropped the frames of a matching record. `hermes logs` now
reads each unstamped line as part of the record above it: the line gets
that record's verdict for every filter, in the tail read and in `-f`.
Lines before the first stamp in the read window have an unknown time and
level, so they are dropped when `--since` or `--level` is set.
mcp-stderr.log had no parseable stamp at all: the banner started with
`=====` and server output was copied raw, so `hermes logs mcp --since`
printed the whole file. The stderr tee already reads each server's
stderr in a thread, so it now writes one line at a time, each prefixed
with the asctime-shaped local stamp the Python logs use. The banner
starts with the same stamp. The stamp comes from new public
`timestamp()`/`stamp_line()` in hermes_cli/stderr_timestamp.py, which
stays stdlib-only. The desktop MCP log view accepts both banner shapes.
A test now requires a real writer's sample line for every LOG_FILES
entry to parse with `_parse_line_timestamp`. The docs no longer say the
`timezone` key changes log timestamps; log lines use the machine's
local time.
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