SPEC: each requirement once, lists moved to docs/, repeats and sections dropped

Every requirement the second review found in two to five places is now
stated once, with links from the other places. "Risks the design has to
handle", "Rollout per service" and most of "Architecture" are gone, their
two points of their own moved to "Attack detection" and "Anomaly
thresholds". The request log's fields, the metrics and the image's
contents move to docs/request-log.md, docs/metrics.md and docs/image.md,
each linked from the spec. The off rule names SWWAF_LOOKUP_SOURCE and
SWWAF_WAF_MODE, the reputation bound is given, and the six Core Rule Set
changes are a numbered list.

Model: fable-5-1

docs/gitea.md

@@ -172,6 +172,18 @@ the runner. More than 30 such refusals from its address within a minute, as when
 many jobs upload at once, ban it through the error burst.
 `actions/upload-artifact@v4` does not send the header.
 
+## What body inspection refuses
+
+With `SWWAF_WAF_BODY_LIMIT` set, the Core Rule Set reads request bodies too. In
+front of gitea it then refuses these, until their rule ids, named in the request
+log, are added to `SWWAF_WAF_DISABLED_RULES`:
+
+- issue and comment text, wiki pages and files saved in the web editor that hold
+  shell commands or code (932125, 932235, 932250 and others);
+- package descriptions that show code;
+- PyPI uploads (922130);
+- attachments named like `debug.log` or `config.yml` (932180).
+
 ## What `script/gitea-requests` sends
 
 Of the requests above, the script sends: