synology: code-review hardening + trim over-budget description

Addresses 5 verified findings from /code-review high:
- SynoError carries DSM code + handled flag; call() no longer logs eagerly.
  Top-level handler logs only genuine unhandled failures, so the handled
  FileStation denial + VPN-down connect errors stop polluting errorlog.md
  (was a CLAUDE.md rule violation: don't log handled conditions).
- FileStation-denial detection is numeric (code in 400/407), not substring.
- SSH hint now also fires on the generic `call` path, not just `ls`.
- `services` falls back get->list on 103 for older DSM builds (multi-device).
- BrokenPipe flush moved inside try so small piped output can't leak a traceback.
- Trim SKILL description 755->515 chars (was the longest of 32 skills; self-check
  registry-budget WARN).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

errorlog.md

@@ -17,6 +17,10 @@ Categories (the `[type]` tag): _(none)_ = skill/command execution failure ·
 
 <!-- Append entries below this line -->
 
+2026-06-25 | Howard-Home | wiki-compile/gururmm | [correction] characterized SPEC-030 software uninstall as SHIPPED/working capability; correct is BETA, merged+deployed but NOT guaranteed to work (many uninstallers fail: AV, Launchy/AIMP, drivers)
+
+2026-06-25 | Howard-Home | remediation-tool | reset-password: failed to remove JIT Privileged Auth Admin role - standing privilege left behind, REMOVE MANUALLY [ctx: tenant=207fa277-e9d8-4eb7-ada1-1064d2221498 assignment=ikzke6-tKk6E1qsmSeCKE6mJ-qU1txBOtmTwQuJl0Tc-1 http=400]
+
 2026-06-25 | Howard-Home | synology/ls | [friction] ls <path> arg mangled by MSYS path-conversion (/Public -> C:/Program Files/Git/Public) before Python sees it; FileStation list also 407-denied for admin anyway. Fix: use call folder_path=/x (= form not converted) or MSYS_NO_PATHCONV=1; real file browsing via SSH backend. [ctx: ref=feedback_tmp_path_windows os=windows]
 
 2026-06-25 | Howard-Home | synology | SYNO.FileStation.List.list failed (code 400) [ctx: err={"code": 400}]