Add supply chain demo

[katherineh123]

Description

Adds supply chain NemoClaw workshop demo to the
community archive under examples/supply-chain-demo/.

The demo includes participant instructions, supply chain
knowledge-base context, sample factory delivery data, and the VM
setup script for provisioning participant-specific NemoClaw
sessions.

Verification

• git diff --check
• Relevant example setup or syntax checks
  • bash -n examples/supply-chain-demo/setup_exec_demo.sh
  • Secret-pattern scan over examples/supply-chain-demo

Release And Compliance

• No secrets, local .env files, private certificates,
  snapshots, or token caches are included.
• Third-party dependency changes are reflected in THIRD- PARTY-NOTICES.
  • No third-party dependency inventory changes.
• Commits include DCO sign-off (git commit -s).

[nv-nedelman-1]

Closing this PR for now - it needs to be re-framed as a minimal example (rather than a demo) with setup/teardown scripts before merge