Show graph stats summary after watch generates initial files (#55)

* Show graph stats summary after watch generates initial files

When `supermodel watch` completes its initial generate (or loads from
cache), it now prints a human-readable summary line:

  ✓  847 files · 12,340 functions · 4,521 relationships  (fetched)

Incremental updates after hook notifications print a shorter update:

  ✓  Updated — 847 files · 12,340 functions · 4,521 relationships

Implementation:
- Add GraphStats struct and computeStats() to internal/files/graph.go
- Add OnReady(GraphStats) and OnUpdate(GraphStats) callbacks to DaemonConfig
- Track loadedCache bool on Daemon to distinguish API fetch vs cache hit
- Wire styled stdout callbacks in files.Watch()

Closes #51

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix goimports: remove stray blank line in daemon.go

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Address CodeRabbit review: dead function count, label fix

- Add DeadFunctionCount to GraphStats (functions with no callers),
  computed via Cache.Callers in computeStats()
- Show uncalled count in OnReady summary when non-zero:
  ✓  847 files · 12,340 functions · 4,521 relationships · 23 uncalled
- Fix writeStatus label: was "nodes", now "files" to match SourceFiles value

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: greynewell

internal/files/daemon.go

@@ -25,7 +25,10 @@ type DaemonConfig struct {
 	FSWatch      bool
 	PollInterval time.Duration
 	LogFunc      func(string, ...interface{})
-	OnReady      func()
+	// OnReady is called once after the initial generate completes.
+	OnReady func(GraphStats)
+	// OnUpdate is called after each incremental update completes.
+	OnUpdate func(GraphStats)
 }
 
 // Daemon watches for file changes and keeps sidecars fresh.
@@ -35,9 +38,10 @@ type Daemon struct {
 	cache  *Cache
 	logf   func(string, ...interface{})
 
-	mu       sync.Mutex
-	ir       *api.SidecarIR
-	notifyCh chan string
+	mu          sync.Mutex
+	ir          *api.SidecarIR
+	notifyCh    chan string
+	loadedCache bool // true if startup data came from local cache
 }
 
 // NewDaemon creates a daemon with the given config and API client.
@@ -70,7 +74,12 @@ func (d *Daemon) Run(ctx context.Context) error {
 	if err := d.loadOrGenerate(ctx); err != nil {
 		return fmt.Errorf("startup: %w", err)
 	}
-	d.writeStatus(fmt.Sprintf("ready — %s — %d nodes",
+
+	d.mu.Lock()
+	stats := computeStats(d.ir, d.cache)
+	stats.FromCache = d.loadedCache
+	d.mu.Unlock()
+	d.writeStatus(fmt.Sprintf("ready — %s — %d files",
 		time.Now().Format(time.RFC3339), len(d.ir.Graph.Nodes)))
 
 	d.logf("[step:2] Starting listeners")
@@ -90,7 +99,7 @@ func (d *Daemon) Run(ctx context.Context) error {
 		d.logf("[step:3] Ready — listening on UDP :%d (debounce %s)", d.cfg.NotifyPort, d.cfg.Debounce)
 	}
 	if d.cfg.OnReady != nil {
-		d.cfg.OnReady()
+		d.cfg.OnReady(stats)
 	}
 
 	var (
@@ -147,6 +156,7 @@ func (d *Daemon) loadOrGenerate(ctx context.Context) error {
 			d.ir = &ir
 			d.cache = NewCache()
 			d.cache.Build(&ir)
+			d.loadedCache = true
 			d.mu.Unlock()
 
 			files := d.cache.SourceFiles()
@@ -241,16 +251,20 @@ func (d *Daemon) incrementalUpdate(ctx context.Context, changedFiles []string) {
 
 	d.logf("Updated %d sidecars", written)
 
-	var nodeCount int
+	var updateStats GraphStats
 	func() {
 		d.mu.Lock()
 		defer d.mu.Unlock()
 		d.saveCache()
-		nodeCount = len(d.ir.Graph.Nodes)
+		updateStats = computeStats(d.ir, d.cache)
 	}()
 
-	d.writeStatus(fmt.Sprintf("ready — %s — %d nodes",
-		time.Now().Format(time.RFC3339), nodeCount))
+	d.writeStatus(fmt.Sprintf("ready — %s — %d files",
+		time.Now().Format(time.RFC3339), updateStats.SourceFiles))
+
+	if d.cfg.OnUpdate != nil {
+		d.cfg.OnUpdate(updateStats)
+	}
 }
 
 // saveCache writes the current merged SidecarIR to the cache file. Must be called with d.mu held.

internal/files/graph.go

@@ -45,6 +45,34 @@ type Cache struct {
 	FileDomain map[string]string      // filePath → domain name
 }
 
+// GraphStats summarises what was mapped after a generate or incremental update.
+type GraphStats struct {
+	SourceFiles       int
+	Functions         int
+	Relationships     int
+	DeadFunctionCount int  // functions with no callers (proxy for unreachable code)
+	FromCache         bool // true when data was loaded from a local cache
+}
+
+// computeStats derives a GraphStats from a SidecarIR and its built Cache.
+func computeStats(ir *api.SidecarIR, c *Cache) GraphStats {
+	s := GraphStats{
+		Relationships: len(ir.Graph.Relationships),
+	}
+	for _, n := range ir.Graph.Nodes {
+		switch {
+		case n.HasLabel("File"):
+			s.SourceFiles++
+		case n.HasLabel("Function"):
+			s.Functions++
+			if len(c.Callers[n.ID]) == 0 {
+				s.DeadFunctionCount++
+			}
+		}
+	}
+	return s
+}
+
 // NewCache creates an empty Cache.
 func NewCache() *Cache {
 	return &Cache{

internal/files/handler.go

@@ -16,6 +16,15 @@ import (
 	"github.com/supermodeltools/cli/internal/ui"
 )
 
+// ANSI helpers used only for watch summary output.
+const (
+	ansiReset  = "\033[0m"
+	ansiBold   = "\033[1m"
+	ansiGreen  = "\033[32m"
+	ansiBGreen = "\033[1;32m"
+	ansiDim    = "\033[2m"
+)
+
 // GenerateOptions configures the generate command.
 type GenerateOptions struct {
 	Force     bool
@@ -161,6 +170,31 @@ func Watch(ctx context.Context, cfg *config.Config, dir string, opts WatchOption
 		FSWatch:      opts.FSWatch,
 		PollInterval: pollInterval,
 		LogFunc:      logf,
+		OnReady: func(s GraphStats) {
+			src := "fetched"
+			if s.FromCache {
+				src = "cached"
+			}
+			line := fmt.Sprintf("\n  %s✓%s  %s%d files%s · %s%d functions%s · %s%d relationships%s",
+				ansiBGreen, ansiReset,
+				ansiBold, s.SourceFiles, ansiReset,
+				ansiBold, s.Functions, ansiReset,
+				ansiBold, s.Relationships, ansiReset,
+			)
+			if s.DeadFunctionCount > 0 {
+				line += fmt.Sprintf(" · %s%d uncalled%s", ansiBold, s.DeadFunctionCount, ansiReset)
+			}
+			line += fmt.Sprintf("  %s(%s)%s\n\n", ansiDim, src, ansiReset)
+			fmt.Print(line)
+		},
+		OnUpdate: func(s GraphStats) {
+			fmt.Printf("  %s✓%s  Updated — %s%d files%s · %s%d functions%s · %s%d relationships%s\n",
+				ansiGreen, ansiReset,
+				ansiBold, s.SourceFiles, ansiReset,
+				ansiBold, s.Functions, ansiReset,
+				ansiBold, s.Relationships, ansiReset,
+			)
+		},
 	}
 
 	d := NewDaemon(daemonCfg, client)