docs: relocate runtime app fixtures

[enricopiovesan]

Summary

Relocate Traverse-owned application manifests and deterministic fixtures from
apps/ into examples/, and record the approved ownership boundary.

Governing Spec

• 004-spec-alignment-gate
• 008-expedition-example-domain
• 028-schema-alignment-gate-v02
• 031-supply-chain-hardening
• 040-contractual-enforcement-gate
• 044-application-bundle-manifest
• 052-app-state-machine
• 053-conditional-state-transitions
• 054-public-scope-registry-ref
• 057-embeddable-runtime-host
• 058-workflow-pipeline-execution
• 065-sigstore-bundle-verification
• 068-public-platform-embedder-packages
• 070-runtime-event-sink-boundary

Project Item

Traverse Project 1 — #703

Definition of Done

• Runtime fixtures are under examples/.
• Direct consumers use the new paths.
• The decision log contains the path-by-path ownership inventory.

Validation

• bash scripts/ci/meeting_notes_example_smoke.sh
• bash scripts/ci/traverse_starter_example_smoke.sh
• bash scripts/ci/macos_demo_smoke.sh