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/queries.py

@@ -11,6 +11,7 @@ The LLM's whole job in this project is producing short strings to type into
 Bing, and Bing's own autosuggest answers that question directly.
 """
 
+import logging
 import os
 
 import query_sources
@@ -21,6 +22,8 @@ import query_sources
 # opposite of the point. A trends-only install, the Docker image for instance,
 # does not ship it.
 
+logger = logging.getLogger(__name__)
+
 LLM = "llm"
 TRENDS = "trends"
 
@@ -46,7 +49,7 @@ def search_query_for_task(task_description: str) -> str:
 
 		# Every feed was unreachable. The description still contains the topic,
 		# so a trimmed version beats skipping the card entirely.
-		print("[WARNING] No query source reachable, using the task description as written.")
+		logger.warning("No query source reachable, using the task description as written.")
 
 		return task_description.lower()
 
@@ -63,7 +66,7 @@ def related_queries(count: int):
 		if queries:
 			return queries
 
-		print("[WARNING] No query source reachable, falling back to the wordlist.")
+		logger.warning("No query source reachable, falling back to the wordlist.")
 
 		# nouns.txt is already in the repo for exactly this kind of seed.
 		return query_sources.wordlist_queries(count)