Name request log actions so they say what they mean (closes #229)

The request log's `action` values now say what they mean, as sneak named them: `request_header_too_large`, `client_is_rate_limited`, `blocked_by_block_rule` and `client_denied`, with no aliases. `banned` splits into `temporarily_banned` and `permanently_banned`, by whether the ban runs out. When a permanent ban also covers a client, that ban is the one reported.

Trips a reader: a request over a rate limit stays `client_is_rate_limited` even when the ban it makes is permanent.
Disclosure: the offence key `rule_blocked` is renamed in `clients.json` too, so an existing file holding it stops the start and must be removed. Its `version` stays 1.

Model: opus-5-5

internal/discriminator/bytelimits.go

@@ -6,8 +6,6 @@ package discriminator
 import (
 	"context"
 	"time"
-
-	"sneak.berlin/go/smallwebwaf/internal/requestlog"
 )
 
 // byteLimits counts the request's bytes, as countedBytes gives them, for the
@@ -39,5 +37,5 @@ func (byteLimits) check(_ context.Context, rq *request, now time.Time) *verdict
 
 	rq.banForLimit(now, hit, rq.out.status)
 
-	return &verdict{action: requestlog.ActionBanned, figures: limitFigures(hit)}
+	return &verdict{figures: limitFigures(hit)}
 }