bd doctor: add Claude integration verification checks

Add two new checks to verify Claude Code integration:
- CheckBdInPath: verifies 'bd' is in PATH (needed for hooks)
- CheckDocumentationBdPrimeReference: checks if docs reference 'bd prime'
  and verifies the command exists (detects version mismatches)

Closes bd-o78

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

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

cmd/bd/doctor.go

@@ -327,6 +327,16 @@ func runDiagnostics(path string) doctorResult {
 	result.Checks = append(result.Checks, claudeCheck)
 	// Don't fail overall check for missing Claude integration, just warn
 
+	// Check 11a: bd in PATH (needed for Claude hooks to work)
+	bdPathCheck := convertDoctorCheck(doctor.CheckBdInPath())
+	result.Checks = append(result.Checks, bdPathCheck)
+	// Don't fail overall check for missing bd in PATH, just warn
+
+	// Check 11b: Documentation bd prime references match installed version
+	bdPrimeDocsCheck := convertDoctorCheck(doctor.CheckDocumentationBdPrimeReference(path))
+	result.Checks = append(result.Checks, bdPrimeDocsCheck)
+	// Don't fail overall check for doc mismatch, just warn
+
 	// Check 12: Agent documentation presence
 	agentDocsCheck := convertDoctorCheck(doctor.CheckAgentDocumentation(path))
 	result.Checks = append(result.Checks, agentDocsCheck)