Phase 1: cross-client homelab context + MCP scaffolding

Add the foundation for distributing homelab context to every client
(LXCs, VMs, workstations including republic-laptop, mac-mini, ludo-mini)
with a single source of truth, structured query layer (MCP), and per-client
age-key issuance for secrets:

- inventory.yaml — canonical topology (hosts, services, mesh addresses)
- hosts/*.yaml — per-host identity files generated from inventory by
  mcp/build_host_files.py; do not edit by hand
- AGENTS.md — orientation doc symlinked to /root/AGENTS.md on every client
- bootstrap.sh — one-shot enroll (Linux + macOS), clones repo, fetches age
  key from issuance, installs sync timer/launchd job, drops the homelab CLI
- bin/homelab — single-binary Python CLI: whoami, list, ssh, pct, logs,
  restart, open, status, secret, sync, mcp, client add/remove, nuke
- mcp/server.py — FastMCP server: context tools + read-only management
  tools (no mutations exposed); shell-outs use mcp-reader restricted ssh key
- mcp/deploy/ — claudio-monitor-style gitea webhook deploy scaffold for the
  MCP service on LXC 105 (ports 9810 mcp, 9811 webhook)
- secrets-issuance/ — per-client age key auto-provisioning over the mesh;
  source-IP gated against inventory, with denylist for revoked clients
  (ports 9820 issue, 9821 webhook)
- secrets/, .sops.yaml — SOPS recipient scaffolding; the operator fills in
  age public keys after Phase 3a generates them
- scripts/sync/ — systemd timer (Linux) + launchd plist (macOS) pulling
  /opt/homelab-context every 5 min

Mesh: both Netbird (preferred, 100.122.0.0/16) and Tailscale accepted
during the in-flight migration; no client is gated on completing the move.

Plan reference: /root/.claude/plans/lets-make-a-plan-fluttering-trinket.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

mcp/deploy/webhook/install.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# First-time setup for the homelab-mcp deploy webhook. Generates a secret,
+# installs the systemd unit, and starts it. Re-run is safe (won't regenerate
+# the secret if one exists).
+set -euo pipefail
+
+SECRET_DIR=/etc/homelab-mcp-deploy
+SECRET=$SECRET_DIR/secret
+UNIT=homelab-mcp-deploy.service
+
+install -d -m 700 "$SECRET_DIR"
+if [ ! -s "$SECRET" ]; then
+    head -c 32 /dev/urandom | base64 > "$SECRET"
+    chmod 600 "$SECRET"
+    echo "[install] generated webhook secret at $SECRET"
+fi
+
+systemctl daemon-reload
+systemctl enable --now "$UNIT"
+systemctl status "$UNIT" --no-pager | head -10
+
+cat <<EOF
+
+[install] webhook listening on :9811/deploy.
+Configure Gitea (dtoro/Homelab-Docs → Settings → Webhooks → Add Webhook → Gitea):
+  Target URL:   http://<lxc-105-mesh-ip>:9811/deploy
+  HTTP Method:  POST
+  Content-Type: application/json
+  Secret:       $(cat $SECRET)
+  Trigger:      Push events
+EOF