fix(curogram-mcp): address PR #67 review blockers + suggestions

Curogram MCP:
- auth: cap relogin attempts (MAX_RELOGIN=3) and fail fast on 401 with
  static CDP cookies, so a persistent 401 can no longer loop forever.
- server: validate conversation_id / patient_id / message_id as 24-char
  hex ObjectIds before interpolating into API paths; drop message_length
  from dry-run output; only log "server started" after a successful bind.
- supervisor: replace TOCTOU PID-file lock with a real flock(fd 9);
  derive SERVER_DIR from the script location; export optional CUROGRAM_*
  env vars only when set so unset stays undefined in the child.

RingCentral admin (security):
- require an exact per-request approval_text on update_call_queue_members,
  set_call_queue_ring_type, and set_call_queue_member_order; the dry-run
  preview returns the exact string to confirm. Mirrors the stricter
  create_ai_scheduling_extension gate.
- token cache: store only the keys we use instead of merging the full
  OAuth body (keeps refresh_token out of the cache).

Repo hygiene:
- stop tracking .claude/settings.json (personal rtk PreToolUse hook =
  arbitrary code exec from repo config) and gitignore it.

teams-channel:
- consolidate the four HTTP_ONLY skip logs into one startup banner.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>