bootstrap.sh: symlink homelab CLI instead of copy

The 5-min sync pulls /opt/homelab-context but does not re-install the
CLI. A copy at /usr/local/bin/homelab therefore goes stale after every
CLI fix until someone re-runs bootstrap. Symlinking points
/usr/local/bin/homelab directly at the synced source, so updates land
on the next pull. Doc updated with the one-line migration for hosts
bootstrapped before this commit.

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

operations/agent-enrollment.md

@@ -203,6 +203,8 @@ The CLI prints a follow-up checklist that the operator must do manually:
 | `Invalid Host header` from MCP server | FastMCP's DNS-rebinding protection (default whitelist is 127.0.0.1 only) | Fixed in commit `6848640`; pull latest `mcp/server.py` and redeploy |
 | `python3-yaml` install fails on Fedora | Wrong package name | Use `python3-pyyaml` (Fedora) instead of `python3-yaml` (Debian) |
 | `address already in use` for FastMCP | FastMCP defaults to 127.0.0.1:8000 | Fixed: server now sets `mcp.settings.host/port` from env (default `0.0.0.0:9810`) |
+| `homelab: no age key at /etc/age/key.txt` even after bootstrap | `/etc/age` is 0700 root, so non-root users couldn't even stat the key file; existence check returned False under regular users | Fixed in commit `df6aca8`: the CLI re-execs `sops -d` via sudo when invoked as a non-root user. On older deployments, re-link the CLI with `sudo ln -sfn /opt/homelab-context/bin/homelab /usr/local/bin/homelab` after the 5-min sync. |
+| `homelab` CLI doesn't pick up repo updates | Pre-`02db…` bootstrap copied the binary instead of symlinking | One-time migration: `sudo ln -sfn /opt/homelab-context/bin/homelab /usr/local/bin/homelab`. New bootstraps use the symlink, which auto-tracks the synced repo. |
 
 ## Changelog