CLI-032 — Implement `stellarforge test` unified test orchestration MVP

[dDevAhmed]

Summary

Implement the MVP testing command that delegates to supported project test workflows while preserving meaningful failures.

Scope

• register test command;
• detect/resolve supported generated-project test commands;
• invoke tests safely without shell interpolation;
• stream output and preserve child exit code semantics;
• tests with controlled fixture projects.

Acceptance Criteria

• supported generated projects can run their tests through stellarforge test;
• failing project tests produce a non-zero CLI result;
• output is not swallowed or misreported;
• unsupported project layouts fail with actionable guidance;
• subprocess invocation is safe and tested.

Dependencies

• CLI-003
• CLI-005
• CLI-006
• generated template conventions

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🏷 Labels

• type: feature
• area: testing
• priority: P1
• difficulty: intermediate