Add support escalation demo content

[rogerchappel]

Summary

• add a runnable support escalation demo that builds ClipCase, captures repro and terminal fixtures, searches, exports, and verifies the handoff
• add a support escalation tutorial and launch-note draft grounded in existing fixtures

Verification

• npm install --ignore-scripts --no-audit --no-fund
• bash demo/run-support-escalation.sh
• npm run check