style: gofmt all packages (#4)

Applies gofmt to the 18 files that were already unformatted at HEAD (pre-existing debt — 122 insertions / 122 deletions, whitespace plus import-block reorderings only; `git diff -w` confirms no semantic changes).

Kept on its own branch so the functional change set (see the review-hardening PR) stays reviewable without formatting noise.

Verified: go build, go vet, go test ./... pass on this branch; a merge simulation with the functional branch produces a clean 3-way merge with all tests green.
Reviewed-on: #4
Co-authored-by: David Gwilliam <dhgwilliam@gmail.com>
Co-committed-by: David Gwilliam <dhgwilliam@gmail.com>

main.go

@@ -5,11 +5,11 @@ import (
 	"log"
 	"os"
 
-	mcpServer "github.com/mark3labs/mcp-go/server"
-	"github.com/spf13/cobra"
 	knoxcmd "github.com/david/knox/internal/cmd"
 	"github.com/david/knox/internal/db"
 	knoxserver "github.com/david/knox/internal/server"
+	mcpServer "github.com/mark3labs/mcp-go/server"
+	"github.com/spf13/cobra"
 )
 
 func newServeCmd(kdb *db.KnoxDB) *cobra.Command {