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/b2/scripts/b2.py

@@ -32,12 +32,32 @@ from __future__ import annotations
 
 import argparse
 import json
+import os
+import subprocess
 import sys
 from typing import Optional
 
 from b2_client import B2Client, B2Error, RATE_PER_GB_USD, BYTES_PER_GB, BYTES_PER_GIB
 
 
+def _log_skill_error(skill, msg, context=""):
+    """Soft-fail: append a functional-error entry to errorlog.md (never throws)."""
+    try:
+        root = os.environ.get("CLAUDETOOLS_ROOT") or os.path.abspath(
+            os.path.join(os.path.dirname(__file__), "..", "..", "..", "..")
+        )
+        h = os.path.join(root, ".claude", "scripts", "log-skill-error.sh")
+        if not os.path.exists(h):
+            return
+        a = ["bash", h, skill, msg]
+        if context:
+            a += ["--context", context]
+        subprocess.run(a, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+                       timeout=10)
+    except Exception:
+        pass
+
+
 def _emit(obj, as_json: bool, table_fn=None) -> None:
     if as_json or table_fn is None:
         print(json.dumps(obj, indent=2, default=str))
@@ -757,6 +777,10 @@ def main(argv=None) -> int:
         return rc if isinstance(rc, int) else 0
     except B2Error as exc:
         print(f"[ERROR] {exc}", file=sys.stderr)
+        _log_skill_error("b2", f"{exc}",
+                         context=f"cmd={getattr(args, 'command', '?')}"
+                                 + (f" http={exc.status}" if exc.status else "")
+                                 + (f" code={exc.code}" if exc.code else ""))
         return 1
     except KeyboardInterrupt:
         return 130