feat: re-add per-run sud log alongside the continuous server log

SudLogTask reuses ServerLogTask's sample format but only records while
a Sud run is active: starts on Play (fresh start only, not a Pause
resume) and writes logs/log_{date_time}_{sud_name}.log on Stop or
natural completion.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TvgC7oy9MxaA4ZQxXqkNdS

tasks/sud_log.py

@@ -0,0 +1,42 @@
+import time
+from tasks.server_log import ServerLogTask
+from components import APid, AHeater
+
+
+def _safe_filename_part(text):
+	return "".join(c if c.isalnum() or c in "-_" else "_" for c in text) or "Sud"
+
+
+class SudLogTask(ServerLogTask):
+	"""Records temp/power samples for a single Sud run - same sample format
+	as ServerLogTask, but only while a run is active: recording starts on
+	Play and is written out on Stop (or natural completion), to
+	logs/log_{date_time}_{sud_name}.log. A Pause/resume doesn't start a new
+	file - only a fresh Play (from IDLE/DONE) does."""
+
+	def __init__(self, tc: APid, heater: AHeater, heater_task, sud, interval, path='./logs', config=None, dt=None):
+		ServerLogTask.__init__(self, tc, heater, heater_task, interval, path, config, dt)
+		self.sud = sud
+		self._active = False
+
+	def _should_sample(self):
+		return self._active
+
+	def _filename(self):
+		name_part = _safe_filename_part(self.sud.name or 'Sud')
+		return 'log_{}_{}.log'.format(self._run_id, name_part)
+
+	def start_run(self):
+		if self._active:
+			return
+		self._samples = []
+		self._t0 = time.monotonic()
+		self._run_id = time.strftime("%Y%m%dT%H%M%S", time.localtime())
+		self._active = True
+
+	def stop_run(self):
+		if not self._active:
+			return
+		self._active = False
+		self.write()
+		self._param_events = []