Sets from Jarl: sets holding the addresses of names in Jarl

A set can take its addresses from Jarl: every A and AAAA record of its
names (NAME@VIEW), CNAMEs followed within Jarl's zones in the same view.
housecarld reads them every jarl.refresh and after each change, keeps
only the addresses within the zones and networks the set allows, and
keeps what it last read (saved in the database and the boot ruleset)
while Jarl can't be reached. A change of the addresses applies the
ruleset again without a history entry and is audited (set.jarl).

hc set add --jarl --within, hc set jarl; the kind "from Jarl" and
Addresses… on the Sets page; GET /sets/{name}/jarl and /jarl/refresh;
validation codes set_jarl_*, status warnings jarl_*; docs/jarl.md.
e2e phase with scripts/fakejarl.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/permissions.md

@@ -8,7 +8,7 @@ else gets **grants**, `resource:access`:
 | Resource | read | write |
 |---|---|---|
 | `config` | settings, zones, sets, services, rules, NAT, the ruleset, history, interfaces, probation, changesets (the web UI shows the forms locked) | change them, stage and apply changesets (your own, or anyone's for administrators), undo, import, confirm and roll back; close connections; start and stop traces |
-| `sets` | dynamic sets' entries | add and remove entries |
+| `sets` | dynamic sets' entries, what sets from Jarl hold | add and remove entries |
 | `bans` | ban lists' bans, and the lists the grant names | ban and unban ([bans.md](bans.md)) |
 | `log` | hit counters, the log, connections, traces | – |
 | `audit` | the audit log | – |