fix(examples): complete runtime fixture relocation

[enricopiovesan]

Summary

• complete the runtime-fixture relocation begun by docs: relocate runtime app fixtures #705 by moving both component manifests
• correct relocated workflow, contract, and WASM paths and update the Web embedder documentation
• add a repository regression guard and focused public-contract validation for the ownership boundary

Governing Spec

• 004-spec-alignment-gate
• 044-application-bundle-manifest
• 052-app-state-machine
• 053-conditional-state-transitions
• 054-public-scope-registry-ref
• 068-public-platform-embedder-packages
• 070-runtime-event-sink-boundary

Project Item

Closes #703

Definition of Done

• Decision 22 records the application-source/runtime-fixture ownership boundary.
• Every prior apps/ subtree has an explicit owner and destination.
• Runtime-owned application and component manifests plus shared fixtures live under examples/.
• Documentation, scripts, CI, and package references use the relocated paths.
• A repository guard prevents runtime-owned fixtures from returning under apps/.
• Focused validation executes both fixture agents and validates both relocated application bundles through the public CLI contract.

Validation

• bash scripts/ci/app_ownership_boundary_smoke.sh
• bash scripts/ci/repository_checks.sh
• git diff --check