CLI-031 — Implement `stellarforge dev` process orchestration MVP

[dDevAhmed]

Summary

Implement the MVP local-development orchestration command for supported generated projects.

Scope

• register dev command;
• load validated project configuration;
• start required child processes safely;
• stream prefixed logs;
• handle signals/cancellation;
• clean up child processes deterministically;
• tests with controlled subprocess fixtures.

Security Requirements

Use argument-array process execution with shell mode disabled. Do not expose secrets in logs or inherit unnecessary sensitive environment values.

Acceptance Criteria

• supported project processes start through one command;
• process startup failures are actionable and non-zero;
• SIGINT/SIGTERM cleanup is tested;
• no orphan processes remain after normal cancellation in tests;
• output works in TTY and CI/non-TTY contexts.

Dependencies

• CLI-003
• CLI-005
• CLI-006
• generated project conventions from CLI-027 through CLI-030 as relevant

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🏷 Labels

• type: feature
• area: dev
• priority: P1
• difficulty: advanced
• security-sensitive