fix: stamp PlantParams with each logger's own elapsed, not Sud.elapsed

log_plant_params() stored whatever elapsed it was handed - always
Sud.elapsed - regardless of which logger's own Samples.t timeline it
needed to match. SudLogTask._elapsed() is Sud.elapsed, so its PlantParams
lined up fine, but ServerLogTask._elapsed() is a separate tick counter
since server startup - using Sud.elapsed there put PlantParams.t on a
different scale than its own Samples.t entirely, causing
utils/replay_sim.py to apply grain/water-mass changes at the wrong point
when replaying a server-session log (spotted by comparing its output for
log_latest.json vs log_latest_sud.json from the same session).

Fixed by dropping the elapsed parameter - log_plant_params(params) now
stamps with self._elapsed(), so each logger always uses its own correct
timeline. Cascades into SudTask.set_on_plant_params()'s callback signature
and its wiring in server/brewpi.py.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JFDeoTKBDkXRhPfnyDEoBt

tasks/server_log.py

@@ -32,8 +32,16 @@ class ServerLogTask(ATask):
 		self._run_id = time.strftime("%Y%m%dT%H%M%S", time.localtime())
 		self._last_write = time.monotonic()
 
-	def log_plant_params(self, elapsed, params):
-		self._param_events.append({'t': elapsed, 'params': params})
+	def log_plant_params(self, params):
+		# Stamped with this logger's *own* _elapsed() - not, say, Sud.elapsed
+		# passed in from the caller - so PlantParams' 't' always lines up
+		# with this same log's own Samples' 't'. SudLogTask's _elapsed() IS
+		# Sud.elapsed, but ServerLogTask's is its own independent counter
+		# since server startup, on a completely different timeline (the
+		# server usually starts well before any Sud does) - using the
+		# wrong one made utils/replay_sim.py apply plant-param changes at
+		# the wrong point in ServerLogTask's own Samples entirely.
+		self._param_events.append({'t': self._elapsed(), 'params': params})
 
 	async def on_process(self):
 		while True: