log: send records natively to journald, keep stdout off-unit

A record written to stdout carries no priority, so journald files the
whole stream at one level and the swarm log store shows `info` whatever
level `tracing` gave it. Under a systemd unit the process's stdout
already *is* the journal, so the fix is to speak the journal protocol
directly and let each record carry its own severity.

New `hive-log` crate holds the one sink chooser, called by `hive-c0re`,
`hive-agent` and `swarm-controller`. It builds the same `EnvFilter`
those binaries always built, then installs exactly one layer — never
both, since a journald layer stacked on the `fmt` layer under a unit
stores every record twice.

The choice is an fstat compare, not a presence test: a child inherits
`$JOURNAL_STREAM` even when its own stdout was redirected elsewhere, so
the variable existing proves nothing. The crate parses `dev:inode` out
of it and compares both numbers against an fstat of stdout, the
descriptor the `fmt` layer writes to by default. No match, unset, or
unparseable takes the `fmt` branch. A journald layer that fails to
construct despite a match falls back to `fmt` and warns through it —
a process must never fail to start because of its logger.

hive-agent/Cargo.toml

@@ -23,6 +23,7 @@ clap.workspace = true
 hive-claude.workspace = true
 hive-agent-sock.workspace = true
 hive-core-agent-sock.workspace = true
+hive-log.workspace = true
 hive-sh4re.workspace = true
 hive-sock-client.workspace = true
 libc.workspace = true
@@ -42,7 +43,6 @@ tokio.workspace = true
 tokio-stream.workspace = true
 tower-http.workspace = true
 tracing.workspace = true
-tracing-subscriber.workspace = true
 
 [dev-dependencies]
 tempfile = "3"