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_integration_test.go

@@ -3,7 +3,6 @@
 package cmd
 
 import (
-	"encoding/json"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -61,22 +60,6 @@ func TestInstallCreatesCorrectStructure(t *testing.T) {
 		t.Errorf("rigs.json should be empty, got %d rigs", len(rigsConfig.Rigs))
 	}
 
-	// Verify mayor/state.json
-	statePath := filepath.Join(hqPath, "mayor", "state.json")
-	assertFileExists(t, statePath, "mayor/state.json")
-
-	stateData, err := os.ReadFile(statePath)
-	if err != nil {
-		t.Fatalf("failed to read state.json: %v", err)
-	}
-	var state map[string]interface{}
-	if err := json.Unmarshal(stateData, &state); err != nil {
-		t.Fatalf("failed to parse state.json: %v", err)
-	}
-	if state["role"] != "mayor" {
-		t.Errorf("state.json role = %q, want %q", state["role"], "mayor")
-	}
-
 	// Verify CLAUDE.md exists
 	claudePath := filepath.Join(hqPath, "CLAUDE.md")
 	assertFileExists(t, claudePath, "CLAUDE.md")