merge the logging work into the feature branch

Both change main.py and README.md, and three separate pull requests touching
the same entry point is worse for review than one. Resolved by keeping every
section of the README and folding the logging setup into the new multi-account
main, so the profile-in-use message from #35 is now a logger.error and uses
log_utils.exception_summary rather than repeating the truncation inline.

queries.py moves to logging with the rest of the runtime.

src/main.py

@@ -1,6 +1,8 @@
+import logging
 import os
 import sys
 
+import log_utils
 import accounts
 import rewards_tasks
 import mouse_trajectory
@@ -10,6 +12,8 @@ from selenium.common.exceptions import SessionNotCreatedException
 
 HEADLESS = os.environ.get("REWARDS_HEADLESS", "").strip().lower() in ("1", "true", "yes")
 
+logger = logging.getLogger(__name__)
+
 
 def build_options(account: accounts.Account) -> webdriver.EdgeOptions:
 	options = webdriver.EdgeOptions()
@@ -41,11 +45,11 @@ def run_account(account: accounts.Account) -> bool:
 		# is already open the driver's copy exits during startup, and selenium
 		# reports it as the browser crashing with a message that names neither
 		# the profile nor the other window.
-		print(f"[FAIL] {account.name}: could not start Edge with this profile.")
-		print(f"       profile directory: {account.user_data_dir}")
-		print("       The usual cause is that this profile is already open in another")
-		print("       Edge window, including one left over from a previous run.")
-		print(f"       driver said: {str(exc).strip().splitlines()[0]}")
+		logger.error("[FAIL] %s: could not start Edge with this profile.", account.name)
+		logger.error("       profile directory: %s", account.user_data_dir)
+		logger.error("       The usual cause is that this profile is already open in another")
+		logger.error("       Edge window, including one left over from a previous run.")
+		logger.error("       driver said: %s", log_utils.exception_summary(exc))
 
 		return False
 
@@ -62,10 +66,12 @@ def run_account(account: accounts.Account) -> bool:
 
 
 def main() -> int:
+	log_utils.setup_logging()
+
 	try:
 		configured = accounts.configured()
 	except ValueError as exc:
-		print(f"[FAIL] {exc}")
+		logger.error("[FAIL] %s", exc)
 
 		return 2
 
@@ -73,13 +79,13 @@ def main() -> int:
 
 	for account in configured:
 		if len(configured) > 1:
-			print(f"\n=== account: {account.name} ===")
+			logger.info("=== account: %s ===", account.name)
 
 		if run_account(account):
 			started += 1
 
 	if len(configured) > 1:
-		print(f"\n{started}/{len(configured)} accounts ran")
+		logger.info("%s/%s accounts ran", started, len(configured))
 
 	# Nothing is watching a container, and stdin is not a terminal there.
 	if not HEADLESS: