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/cmd/install.go

@@ -171,17 +171,6 @@ func runInstall(cmd *cobra.Command, args []string) error {
 	}
 	fmt.Printf("   ✓ Created mayor/rigs.json\n")
 
-	// Create mayor state.json
-	mayorState := &config.AgentState{
-		Role:       "mayor",
-		LastActive: time.Now(),
-	}
-	statePath := filepath.Join(mayorDir, "state.json")
-	if err := config.SaveAgentState(statePath, mayorState); err != nil {
-		return fmt.Errorf("writing mayor state: %w", err)
-	}
-	fmt.Printf("   ✓ Created mayor/state.json\n")
-
 	// Create Mayor CLAUDE.md at HQ root (Mayor runs from there)
 	if err := createMayorCLAUDEmd(absPath, absPath); err != nil {
 		fmt.Printf("   %s Could not create CLAUDE.md: %v\n", style.Dim.Render("⚠"), err)