harness: fleet-wide functional-error + correction + friction logging

Add .claude/scripts/log-skill-error.sh — the canonical agent error log helper
(writes errorlog.md in DATE | MACHINE | skill | [type] error format, soft-fails).
Three categories: execution failures (default), user corrections (--correction),
and preventable self-inflicted friction (--friction; cite ref= when it repeats a
documented gotcha). Goal: stop paying tokens twice for the same avoidable mistake.

- CLAUDE.md: make logging mandatory for all skills + corrections + friction.
- skill-creator: new skills must wire in the helper (guidance + checklist).
- Retrofit every skill script's genuine failure branches to call the helper
  (b2/bitdefender/mailprotector/packetdial/coord python CLIs; remediation-tool
  + onboard365 bash; vault, rmm-auth, post-bot-alert, agy, grok, 1password,
  run-onboarding-diagnostic). Handled conditions + self-tests left alone.
- errorlog.md: broaden header to cover skills + harness + corrections; seed this
  session's corrections (INKY, Mail.Send token-audience, omnibox-strictness) and
  friction (git-bash /tmp, env-persistence, argv-limit, PowerShell var-case).

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

.claude/skills/onboard365/scripts/onboard365.sh

@@ -20,6 +20,7 @@ set -euo pipefail
 TENANT_ADMIN_APPID="709e6eed-0711-4875-9c44-2d3518c47063"
 CONSENT_BASE="https://login.microsoftonline.com"
 CONSENT_REDIRECT="https://azcomputerguru.com"
+__ROOT="${CLAUDETOOLS_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/../../../.." && pwd)}"
 
 # ── Locate the reused remediation-tool scripts ────────────────────────────────
 # Prefer the applied global copy (stable path on every fleet machine); fall back
@@ -43,6 +44,7 @@ RT="$(find_rtool)" || {
   echo "[ERROR] remediation-tool scripts not found." >&2
   echo "        Expected: \$HOME/.claude/skills/remediation-tool/scripts/onboard-tenant.sh" >&2
   echo "        Run a repo sync, or check identity.json.claudetools_root." >&2
+  bash "$__ROOT/.claude/scripts/log-skill-error.sh" "onboard365" "onboard365: remediation-tool scripts not found (onboard-tenant.sh missing on this machine)" >/dev/null 2>&1 || true
   exit 3
 }