fix: remove vestigial state.json files from agent directories

Agent directories (witness/, refinery/, mayor/) contained state.json files
with last_active timestamps that were never updated, making them stale and
misleading. This change removes:

- initAgentStates function that created vestigial state.json files
- AgentState type and related Load/Save functions from config package
- MayorStateValidCheck from doctor checks
- requesting_* lifecycle verification (dead code - flags were never set)
- FileStateJSON constant and MayorStatePath function

Kept intact:
- daemon/state.json (actively used for daemon runtime state)
- crew/<name>/state.json (operational CrewWorker metadata)
- Agent state tracking via beads (the ZFC-compliant approach)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/rig/manager.go

@@ -133,9 +133,9 @@ func (m *Manager) loadRig(name string, entry config.RigEntry) (*Rig, error) {
 		}
 	}
 
-	// Check for witness (witnesses don't have clones, just state.json)
-	witnessStatePath := filepath.Join(rigPath, "witness", "state.json")
-	if _, err := os.Stat(witnessStatePath); err == nil {
+	// Check for witness (witnesses don't have clones, just the witness directory)
+	witnessPath := filepath.Join(rigPath, "witness")
+	if info, err := os.Stat(witnessPath); err == nil && info.IsDir() {
 		rig.HasWitness = true
 	}
 
@@ -414,11 +414,6 @@ Use crew for your own workspace. Polecats are for batch work dispatch.
 		return nil, fmt.Errorf("creating polecats dir: %w", err)
 	}
 
-	// Initialize agent state files
-	if err := m.initAgentStates(rigPath); err != nil {
-		return nil, fmt.Errorf("initializing agent states: %w", err)
-	}
-
 	// Initialize beads at rig level
 	fmt.Printf("  Initializing beads database...\n")
 	if err := m.initBeads(rigPath, opts.BeadsPrefix); err != nil {
@@ -484,33 +479,6 @@ func LoadRigConfig(rigPath string) (*RigConfig, error) {
 	return &cfg, nil
 }
 
-// initAgentStates creates initial state.json files for agents.
-func (m *Manager) initAgentStates(rigPath string) error {
-	agents := []struct {
-		path string
-		role string
-	}{
-		{filepath.Join(rigPath, "refinery", "state.json"), "refinery"},
-		{filepath.Join(rigPath, "witness", "state.json"), "witness"},
-		{filepath.Join(rigPath, "mayor", "state.json"), "mayor"},
-	}
-
-	for _, agent := range agents {
-		state := &config.AgentState{
-			Role:       agent.role,
-			LastActive: time.Now(),
-		}
-		data, err := json.MarshalIndent(state, "", "  ")
-		if err != nil {
-			return err
-		}
-		if err := os.WriteFile(agent.path, data, 0644); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 // initBeads initializes the beads database at rig level.
 // The project's .beads/config.yaml determines sync-branch settings.
 // Use `bd doctor --fix` in the project to configure sync-branch if needed.