Onboarding guide + Howard's own Gitea account + first-time tutorial flow

- ONBOARDING.md: comprehensive guide explaining WHY the setup exists
  (vault, session logs, skills, agents, Ollama/GrepAI, daily workflow).
  Written for someone who's never used Claude Code before.
- CLAUDE.md: on first sync, Claude walks new users through ONBOARDING.md
  section by section + sets up git remote for their own Gitea account.
- users.json: Howard's gitea_username added (own account, admin on all repos).

Audit findings noted: GrepAI not installed, Ollama not running,
MCP_SERVERS.md missing. These need fixing per-machine before onboarding
is fully smooth.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/users.json

@@ -18,7 +18,10 @@
       "known_machines": ["ACG-TECH03L"],
       "git_name": "Howard Enos",
       "git_email": "howard@azcomputerguru.com",
-      "notes": "Employee, Mike's brother. Full trust. Same access as Mike for MSP tracking and daily work."
+      "gitea_username": "howard",
+      "gitea_initial_password": "ACG-Tech2026!",
+      "gitea_must_change_password": true,
+      "notes": "Employee, Mike's brother. Full trust. Same access as Mike for MSP tracking and daily work. Has own Gitea account (howard) with admin access to all repos."
     }
   },
   "roles": {