cert get: combined file for HAProxy, --local, saved NAME; cert list shows get and last download

- jarl cert get --combined PATH writes the key and full chain in one file
  (mode 600, atomic), kept outside --dir so it can live in HAProxy's crt
  directory; JARL_CERT_COMBINED for the hook. Turning it on, moving it or
  removing it ('') applies from the files on disk and runs the hook.
- jarl cert get --local writes the combined file and runs the hook from
  this host's files, without asking jarld.
- jarl cert saved NAME shows all of one certificate's settings.
- jarl cert list: USES "get" for certificates for other hosts, and a
  PULLED column (last download, "(old)" while a host is behind). Owners
  now see their own downloads (pulled_by), not only administrators.
- jarl cert get without a name refuses per-certificate flags.

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

CHANGELOG.md

@@ -13,6 +13,31 @@ All notable changes to Jarl are documented here. The format follows
   audited, with the address first (`msg="login failed" ip=… user=…`,
   `msg="token refused" ip=…`), for Guard's `jarl` preset or a fail2ban
   filter to ban such addresses (docs/operations.md).
+- **`jarl cert get --combined PATH`** also writes the key and the full
+  chain in one file (mode 600, written all at once), for HAProxy. It
+  belongs outside `--dir`, so a directory of combined files can be
+  HAProxy's `crt` directory. The hook gets it as `JARL_CERT_COMBINED`.
+  Adding it to a certificate this host already has writes it from the
+  files on disk and runs the hook; `--combined ''` removes it.
+- **`jarl cert get --local`** doesn't ask jarld: it writes the combined
+  file and runs the hook from this host's files, to apply a changed
+  setting or test a hook.
+- **`jarl cert saved NAME`** shows all of one certificate's saved
+  settings (names, key type, dir, combined file, hook, server) and this
+  host's copy. The token is never shown.
+- `jarl cert list` has a PULLED column: when the certificate was last
+  downloaded, with `(old)` while a host hasn't fetched the renewed one.
+  The owner of a certificate obtained with `jarl cert get` now sees their
+  own downloads (`pulled_by`) in `jarl cert list` and `jarl cert show`, not
+  only administrators.
+
+### Changed
+
+- `jarl cert list` shows `get` as USES for a certificate obtained with
+  `jarl cert get`, not `-`.
+- `jarl cert get` without a name refuses `--dir`, `--hook`, `--key-type`,
+  `--combined`, `--replace` and `--no-save`, which change one
+  certificate; they used to be ignored.
 
 ## [0.6.3] - 2026-10-21