fix(doctor): Redact project names in PATH root entries

Treat  as a valid delimiter when redacting project-name path components
so PATH entries like /Users/me/SecretProject:/usr/bin do not leak the
project directory name in default redacted doctor output.

This preserves existing behavior for nested paths while covering the
PATH root-component case reported in review.

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

Author: cameroncooke

src/mcp/tools/doctor/doctor.ts

@@ -44,7 +44,7 @@ function redactPathLikeValue(value: string, projectNames: string[], piiTerms: st
   let output = value.replace(USER_HOME_PATH_PATTERN, '/Users/<redacted>');
   for (const projectName of projectNames) {
     const escaped = escapeRegExp(projectName);
-    output = output.replace(new RegExp(`/${escaped}(?=/|$)`, 'g'), '/<redacted>');
+    output = output.replace(new RegExp(`/${escaped}(?=[:/]|$)`, 'g'), '/<redacted>');
     output = output.replace(
       new RegExp(
         `${escaped}(?=[.](xcodeproj|xcworkspace|xcuserstate|swiftpm|xcconfig)(?=$|[^A-Za-z0-9_]))`,