[framework-context/cli] Add deterministic DI graph manifest generation command

[kang-heewon]

Problem

The container can produce dependency graph manifests and croco doctor can inspect .croco/build/di-graph.manifest.json, but the app-facing generation workflow should be explicit and deterministic for 1.0.

Desired outcome

Users and generated apps have a stable command to write and verify DI graph manifests.

Acceptance criteria

• Add or document a command such as croco di graph --write .croco/build/di-graph.manifest.json.
• Ensure deterministic ordering for providers, dependencies, root IDs, and diagnostics.
• Emit stable diagnostic codes for missing providers, circular dependencies, and scope mismatches.
• Add generated app smoke coverage for manifest generation plus croco doctor verification.
• Document the local recovery workflow for DI graph failures.