Scaffold cli-rust: Rust CLI client for traverse-starter (#55)

[enricopiovesan]

Summary

• Add apps/traverse-starter/cli-rust/ — Rust CLI with HTTP polling (Phase 1)
• Commands: traverse-starter run --note "..." and traverse-starter health
• Human-readable colored output by default; --json for machine output
• --base-url / --workspace flags with TRAVERSE_BASE_URL / TRAVERSE_WORKSPACE env fallbacks
• Integration tests against mock HTTP server (mockito)
• Update repository_checks.sh and AGENTS.md platform table

Definition of Done

• cargo build succeeds on macOS and Linux
• traverse-starter run --note "..." executes, polls, and prints result
• --json flag outputs machine-readable JSON
• traverse-starter health prints runtime status
• --base-url and --workspace flags + env var fallbacks work
• Integration test against mock server
• README in cli-rust/ covering build, install, usage examples
• scripts/ci/repository_checks.sh updated to acknowledge cli-rust/ directory

Validation

• bash scripts/ci/repository_checks.sh
• npm run typecheck
• npm run lint
• npm run test
• cargo test in apps/traverse-starter/cli-rust

Closes #55

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