CLI-033 — Implement `stellarforge deploy` Stellar Testnet MVP

[dDevAhmed]

Summary

Implement guarded deployment orchestration for supported generated projects targeting Stellar Testnet only.

Scope

• register deploy command;
• validate supported project/deployment configuration;
• require explicit Testnet target;
• invoke current Stellar deployment tooling safely;
• preserve deployment output/results;
• tests with mocked/controlled command execution plus optional integration coverage.

Security Requirements

Never log secrets/private keys/seed phrases. Do not default to Mainnet. Use safe argument-array subprocess invocation. Validate network and required identifiers before side effects.

Acceptance Criteria

• Testnet deployment path is explicit and validated;
• Mainnet is rejected/not supported in MVP;
• failed deployment returns non-zero with actionable output;
• secrets are not rendered in logs/errors;
• safe subprocess behavior is tested;
• command/reference docs are updated.

Dependencies

• CLI-003
• CLI-005
• CLI-006
• CLI-020
• relevant generated-template conventions

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🏷 Labels

• type: feature
• area: deployment
• priority: P0
• difficulty: expert
• security-sensitive
• stellar