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>

internal/cmd/gossip.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
-	"github.com/spf13/cobra"
 	"github.com/david/knox/internal/db"
 	"github.com/david/knox/internal/watch"
+	"github.com/spf13/cobra"
 )
 
 // NewGossipCmd exposes peer status/diff for the gossip protocol.
@@ -154,4 +154,4 @@ func min(a, b int) int {
 		return a
 	}
 	return b
-}
+}