-v raises the CLI's log level per repeat; -q prints only fatal errors (closes #212)

Every line quak prints on stderr now goes through one log, in src/cli-log.ts, at one of six levels. The default, info, prints what quak printed before. -v adds each retry and the start and end of each refresh and ML data fetch; -vv adds each request with its result. -q prints only fatal lines, and is refused with -v; both are program options. Every non-zero exit logs one fatal line, so a run that exits 1 because files failed says how many and where to look. Every line reporting a failure is at error. --json changes stdout only, so backup and --json runs log their progress on stderr. withRetry and ApiClient report retries and requests through new callbacks.

Model: opus-5-5

TODO.md

@@ -17,16 +17,30 @@ pre-1.0
 
 # Next Step
 
-No bug is open. One change sneak asked for is open:
-https://git.eeqj.de/sneak/quak/issues/212. The check of quak against a live Ente
-account, https://git.eeqj.de/sneak/quak/issues/187, needs an account only sneak
-has, so it waits on him.
+No bug is open, and no change sneak asked for is open. The check of quak against
+a live Ente account, https://git.eeqj.de/sneak/quak/issues/187, needs an account
+only sneak has, so it waits on him.
 
 Tagging and releases are decided by sneak alone, and happen only when he
 declares one.
 
 # Completed Steps
 
+- 2026-10-18: `-v`/`--verbose` raises the CLI's log level once for each repeat,
+  and `-q`/`--quiet` prints only fatal errors
+  (https://git.eeqj.de/sneak/quak/issues/212). The levels are fatal, error,
+  warning, info, debug and trace; the default is info, everything quak printed
+  on stderr before, `-v` gives debug and `-vv` trace. `src/cli-log.ts` holds the
+  level and the log the commands write stderr lines through. Debug adds each
+  retry, which `withRetry` reports through the new `onRetry`, and the start and
+  end of each refresh and ML data fetch; trace adds each request, which
+  `ApiClient` reports through the new `onRequest`. `--json` no longer keeps the
+  progress lines off stderr, so `backup` and `--json` runs log a refresh's
+  progress too. Every line that reports a failed file or album is at error,
+  which the progress callbacks of `backup`, `backup-metadata` and the thumbnail
+  helpers now say, and a command that exits 1 because files or albums failed
+  ends with one fatal line saying how many and where to look.
+
 - 2026-10-18: `quak files` takes the collection ID as an optional argument
   instead of the `--collection` option, which is gone
   (https://git.eeqj.de/sneak/quak/issues/211). With no argument it lists every