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/watch/gossip.go

@@ -33,11 +33,11 @@ type Node struct {
 
 // pingResponse is the anti-entropy summary returned by /v1/ping.
 type pingResponse struct {
-	NodeID   string              `json:"node_id"`
-	Name     string              `json:"name"`
-	Vector   map[string]int64    `json:"vector"`   // node_id → max hcl
-	Peers    []db.PeerInfo       `json:"peers"`    // swarm membership this node knows
-	MaxHCL   *int64              `json:"max_hcl,omitempty"`
+	NodeID string           `json:"node_id"`
+	Name   string           `json:"name"`
+	Vector map[string]int64 `json:"vector"` // node_id → max hcl
+	Peers  []db.PeerInfo    `json:"peers"`  // swarm membership this node knows
+	MaxHCL *int64           `json:"max_hcl,omitempty"`
 }
 
 func (n *Node) Handler() http.Handler {
@@ -123,11 +123,11 @@ func (n *Node) handleBatch(w http.ResponseWriter, r *http.Request) {
 // DiffSummary is the divergence snapshot served at /v1/diff: everything this
 // node observes, plus the status of auto-threaded threads (for tombstones).
 type DiffSummary struct {
-	NodeID        string            `json:"node_id"`
-	Name          string            `json:"name"`
-	Fingerprints  []string          `json:"fingerprints"`
-	ThreadStatus  map[string]string `json:"thread_status"`
-	ObsCount      int               `json:"obs_count"`
+	NodeID       string            `json:"node_id"`
+	Name         string            `json:"name"`
+	Fingerprints []string          `json:"fingerprints"`
+	ThreadStatus map[string]string `json:"thread_status"`
+	ObsCount     int               `json:"obs_count"`
 }
 
 func (n *Node) handleDiff(w http.ResponseWriter, r *http.Request) {
@@ -163,9 +163,9 @@ func writeJSON(w http.ResponseWriter, v any) {
 
 // Client is the pull/push half used by the exchange loop.
 type Client struct {
-	NodeID   string
-	Addr     string
-	Timeout  time.Duration
+	NodeID  string
+	Addr    string
+	Timeout time.Duration
 }
 
 func (c *Client) Ping() (*pingResponse, error) {
@@ -410,4 +410,4 @@ func PeerAddrs() []string {
 		}
 	}
 	return out
-}
+}