Remove Angular support

[pkaminski]

Summary

• remove Angular digest scheduling, watches, model property wrapping, and $scope lifecycle cleanup
• remove Truss.debounceAngularDigest() and the related public type surface
• retain the firetruss Angular module registration and its injectable Truss constant
• remove the legacy Vue render-watcher error patch from Firetruss
• bump the package to 8.0.0 and regenerate the tracked bundles

Impact

Firetruss no longer coordinates Angular digest cycles or automatically cleans up observations through Angular scopes. Consumers of those integration points will need to migrate before upgrading to 8.x. The lightweight Angular module registration remains so existing dependency injection can still resolve Truss.

Firetruss also no longer monkeypatches Vue's render watcher to route otherwise uncaught render errors through Vue.config.errorHandler. That behavior is orthogonal to Firetruss data synchronization and should be installed by the parent application if it is still needed.

Validation

• yarn lint
• yarn test (22 tests)
• yarn grunt clean:dist rollup uglify
• browser-targeted Angular module registration smoke test
• render-watcher patch absence scan
• git diff --check

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