Build Hello Echo from verified Edict artifacts

[flyingrobots]

Outcome

Build the standalone Hello Echo application from exact .edict source and its complete capability closure. Emit the canonical Echo executable-operation package and structurally independent verification report without handwritten package bytes, application-native callbacks, fake transports, or application-specific Echo production code.

Acceptance criteria

• edict.application.json selects the generic Echo target adapter.
• The build loads the exact source, capability manifest, exports, adapter, and target configuration.
• The capability closure is digest-pinned and complete.
• The checked Echo lowerer and separate verifier are invoked through the supported provider-component host.
• .build/application/executable-operation-package.cbor and .build/application/verification-report.cbor are deterministic across repeated builds.
• The repository contains no vendored .git, symlink, or path back to a developer checkout.
• Build and test commands are documented.

Dependency

Satisfied by flyingrobots/edict#169, merged through Edict PR #170 as 296bf1f6c76af1e011f5214b6d3de260c67ca84a.

The native GraphQL blocked by edge is retained as closed dependency evidence. This issue is unblocked.