Phase 14: wire Sentinel presentation readiness - #123

Closes #122

What changed

• declares portable versus live mode when launching Sentinel
• passes the already authorized kubectl context to the live readiness API
• gates both platform demos on Sentinel reporting ready_to_present=true for the correct mode
• records Phase 13 and Phase 14 in the Build Week development record
• documents the visible readiness panel and live evidence behavior

Why

The CLI doctor catches setup problems before launch, but judges also need visible proof that the running presentation stack is healthy. The orchestration scripts now provide truthful mode context and refuse to print PASS when the judge-facing preflight is blocked.

Validation

• full portable platform proof passed through the new readiness gate
• orchestration guard tests passed
• live panel checks returned Ready for Kubernetes, Cilium, Falco, Kyverno, and Chaos Mesh against context argus
• shell syntax and whitespace validation passed