Add welcomebot-reputation CLI and a --reputation log filter

The pre-signup path had no inspection tool. Its activity landed in docker logs
and two sqlite tables with nothing to read them, while the reactive path has
had welcomebot-signups and welcomebot-suspicious all along.

welcomebot-reputation reads reputation_query and reputation_block directly so
it survives log rotation: recent answers, --stats for volume and flag/block
rate by source, --blocks for what is actually in force, and --deferred to see
whether the hourly provider-lookup ceiling is biting. --blocks marks rows GONE
once the reconcile pass finds the block no longer on the Mastodon side, so
"we installed this" and "this is in force" stay distinguishable.

welcomebot-logs --reputation covers the raw lines (pre-blocks, budget
refusals, width-cap narrowings).

bin/welcomebot-logs

@@ -25,6 +25,7 @@ Options:
       --abuse          Only abuse-handler lines (reports, silences, dry-run, tiers).
       --welcome        Only welcome lines.
       --ip             Only IP-scrutiny lines (classifications, ip_block writes, ipapi.is errors).
+      --reputation     Only pre-signup reputation-API lines (pre-blocks, budget refusals).
   -g, --grep PATTERN   Only lines matching PATTERN (extended regex).
   -h, --help           Show this help.
 
@@ -34,6 +35,7 @@ Examples:
   welcomebot-logs -n 1000 --since 24h
   welcomebot-logs -g 'acct=spammer'
   welcomebot-logs --ip --since 24h # recent signup-IP classification decisions
+  welcomebot-logs --reputation -f  # follow pre-signup blocking as it happens
 EOF
 }
 
@@ -45,6 +47,7 @@ while [ $# -gt 0 ]; do
     --abuse)     pattern='welcomebot (report |auto-|\[DRY-RUN\]|tier=|silenc|holds a staff|allowlisted)' ;;
     --welcome)   pattern='welcomebot (welcomed|already welcomed|skipping non-local|queued)' ;;
     --ip)        pattern='welcomebot (flagged signup|ipapi\.is lookup failed|ip_block|unparseable ip)' ;;
+    --reputation) pattern='welcomebot (reputation query|block for ip=.*narrowed)' ;;
     -g|--grep)   shift; pattern="${1:?--grep needs a value}" ;;
     -h|--help)   usage; exit 0 ;;
     *) echo "welcomebot-logs: unknown option: $1" >&2; usage >&2; exit 2 ;;