Makes ./run forge:dns use ctforge by default so http://ctforge:3000 works like mcforge:3000 for magic-civilization. Updated help text, docs examples, and default in cmd_forge_dns.
- README, parent brief with Key Decisions + 8-PR DAG - placement-discovery sub-brief, specialist contract, screen - 2 review rounds to 0 issues, all fixes applied - Follows prospecting patterns, all V4 invariants, citations