fix(namepool): only persist runtime state, not config in state file

The pool state file was saving CustomNames even though Load() ignored
them (CustomNames come from settings/config.json). This caused the
state file to have stale/incorrect custom names data.

Changes:
- Create namePoolState struct for persisting only OverflowNext/MaxSize
- Save() now only writes runtime state, not configuration
- Load() uses the same struct for consistency
- Removed redundant runtime pool update from runNamepoolAdd since
  the settings file is the source of truth for custom names

Fixes: gt-ofqzwv

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/namepool.go

@@ -247,15 +247,9 @@ func runNamepoolAdd(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("saving settings: %w", err)
 	}
 
-	// Also update runtime pool for immediate use
-	pool := polecat.NewNamePool(rigPath, rigName)
-	if err := pool.Load(); err != nil && !os.IsNotExist(err) {
-		return fmt.Errorf("loading pool: %w", err)
-	}
-	pool.AddCustomName(name)
-	if err := pool.Save(); err != nil {
-		return fmt.Errorf("saving pool: %w", err)
-	}
+	// Note: No need to update runtime pool state - the settings file is the source
+	// of truth for custom names. The pool state file only persists OverflowNext/MaxSize.
+	// New managers will load custom names from settings/config.json.
 
 	fmt.Printf("Added '%s' to the name pool\n", name)
 	return nil

internal/polecat/namepool.go

@@ -163,17 +163,14 @@ func (p *NamePool) Load() error {
 		return err
 	}
 
-	var loaded NamePool
+	// Load only runtime state - Theme and CustomNames come from settings/config.json.
+	// ZFC: InUse is NEVER loaded from disk - it's transient state derived
+	// from filesystem via Reconcile(). Always start with empty map.
+	var loaded namePoolState
 	if err := json.Unmarshal(data, &loaded); err != nil {
 		return err
 	}
 
-	// Note: Theme and CustomNames are NOT loaded from state file.
-	// They are configuration (from settings/config.json), not runtime state.
-	// The state file only persists OverflowNext and MaxSize.
-	//
-	// ZFC: InUse is NEVER loaded from disk - it's transient state derived
-	// from filesystem via Reconcile(). Always start with empty map.
 	p.InUse = make(map[string]bool)
 
 	p.OverflowNext = loaded.OverflowNext
@@ -187,7 +184,17 @@ func (p *NamePool) Load() error {
 	return nil
 }
 
+// namePoolState is the subset of NamePool that is persisted to the state file.
+// Only runtime state is saved, not configuration (Theme, CustomNames come from settings).
+type namePoolState struct {
+	RigName      string `json:"rig_name"`
+	OverflowNext int    `json:"overflow_next"`
+	MaxSize      int    `json:"max_size"`
+}
+
 // Save persists the pool state to disk using atomic write.
+// Only runtime state (OverflowNext, MaxSize) is saved - configuration like
+// Theme and CustomNames come from settings/config.json and are not persisted here.
 func (p *NamePool) Save() error {
 	p.mu.RLock()
 	defer p.mu.RUnlock()
@@ -197,7 +204,14 @@ func (p *NamePool) Save() error {
 		return err
 	}
 
-	return util.AtomicWriteJSON(p.stateFile, p)
+	// Only save runtime state, not configuration
+	state := namePoolState{
+		RigName:      p.RigName,
+		OverflowNext: p.OverflowNext,
+		MaxSize:      p.MaxSize,
+	}
+
+	return util.AtomicWriteJSON(p.stateFile, state)
 }
 
 // Allocate returns a name from the pool.