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**Related issue:** #43544.
Moves `fleet-mcp` from `tools/fleet-mcp/` to `cmd/fleet-mcp/`. It is
becoming a production server used by customers, so it now lives under
`cmd/` alongside the other Fleet binaries.
Per the module strategy chosen for this move, it **remains a standalone
Go module** (keeps its own `go.mod`/`go.sum` and isolated deps such as
`mark3labs/mcp-go`, `logrus`, `gorilla/websocket`, `godotenv`) — the
root `github.com/fleetdm/fleet/v4` module is unchanged.
### What changed
- `git mv tools/fleet-mcp/ → cmd/fleet-mcp/` (history preserved as
renames).
- Updated all path references:
- Root `Makefile` `update-go` module list.
- `.github/workflows/test-fleet-mcp.yml` — trigger paths,
`go-version-file`, `working-directory`.
- `.github/dependabot.yml` — gomod directory.
- `cmd/fleet-mcp/render.yaml` — `rootDir`.
- `cmd/fleet-mcp/README.md`, `Makefile`, `schema.go` — path
comments/links.
- `articles/fleet-mcp.md` — README link.
- Removed the `fleet-mcp/` row from `tools/README.md`.
### Follow-up (not in this PR)
- The Render service's Blueprint file path must be updated from
`tools/fleet-mcp/render.yaml` to `cmd/fleet-mcp/render.yaml` in the
Render dashboard.
## Testing
- `go build .` in `cmd/fleet-mcp` — OK
- `go test -race -count=1 ./...` — `ok fleet-mcp`
- [x] QA'd all new/changed functionality manually
