Merge ben1/intelligence-threads-examples-rollout into codex/ent-734-crewai-crews

Graft resolution (her branch predates the crewai-crews rebuild on main):
- page.tsx: jpr5's rebuilt full demo (setThemeColor/updateProverb/
  get_weather tools, seed effect, delete buttons, WeatherCard) is the
  base; her threads shell (drawer + gate + provider) grafted around it;
  agent key AGENT_ID=default (was starterAgent on her branch)
- layout/route/package.json: rollout side (default key, AGENT_URL
  normalization, 1.59.3) + her drawer deps + intelligence route block
- contract test: crewai-crews added to the parameterized array (66/66)
- lockfile regenerated; .gitignore !.env.example negation added

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: BenTaylorDev