Genesis Sprint 7: implement agentforge explain-context MVP

[fadf4life]

Implement the canonical agentforge explain-context MVP in apps/cli after Sprint 7 requirements and architecture decisions are accepted.

Scope:

• add the new CLI command surface
• summarize target project AICS status and key governance entry points
• reuse existing validation behavior for status and actionable missing-context signals
• preserve existing validate-context and init-context behavior
• avoid network access, external services, or provider-specific assumptions

Acceptance criteria:

• the command explains the canonical repo and a scaffolded/minimal AICS project
• invalid AICS context is reported as explanatory output rather than hidden behind a stack trace
• implementation remains aligned with the accepted Sprint 7 requirements and ADR
• no network access or external services are required

[fadf4life]

Shipped in 8671f1a and tagged as Genesis-0.0.7. The canonical CLI now implements agentforge explain-context with a read-only AICS orientation report for valid and incomplete project contexts.