Name log fields, metrics and the Core Rule Set package for what they are (closes #192)

The first half of the naming audit: names now say what they are. `internal/waf` is `internal/coreruleset`. Log fields, the action `blocked_by_core_rule_set`, the metric and the alert event say Core Rule Set. Timings end `_ms`. Percentages say of what, as `rate_limit_percent` and `bytes_limit_percent`. Setting names follow in #234.

Judgement call: `blocked_by_core_rule_set`, not the audit's `core_rule_set_blocked`, to match `blocked_by_block_rule`.
Trips a reader: an existing state file holding `waf_blocked` or the anomaly scope `watch` stops the start and must be removed. `SWW_ALERT_EVENTS` listing `waf_block` must list `core_rule_set_match`.

Model: opus-5-5

internal/lookup/lookup.go

@@ -198,7 +198,7 @@ func (g *GeoJS) LookUp(ctx context.Context, client netip.Prefix) Answer {
 
 	answer, found := g.kept(client)
 	if !found {
-		g.metrics.GeoJSUnanswered.Inc()
+		g.metrics.RequestsWithoutGeoJSAnswer.Inc()
 	}
 
 	w, waiting := g.waiting[client]
@@ -296,7 +296,7 @@ func (g *GeoJS) answerOrWait(
 	}
 
 	if w == nil {
-		g.metrics.GeoJSUnanswered.Inc()
+		g.metrics.RequestsWithoutGeoJSAnswer.Inc()
 
 		return Answer{}, nil // too many clients wait already
 	}
@@ -307,7 +307,7 @@ func (g *GeoJS) answerOrWait(
 	}
 
 	if w.late {
-		g.metrics.GeoJSUnanswered.Inc()
+		g.metrics.RequestsWithoutGeoJSAnswer.Inc()
 
 		return Answer{}, nil
 	}