[enilsen16]

Problem

trogon-atlas apply --dry-run runs only the per-entity checks. The model-level rules (storyboard entries, projection order, field provenance) run only in ValidateEventModel. The CLI has no command that calls it, so an author who uses only the CLI does not see these findings.

Change

• Add trogon-atlas validate <namespace>/<model>[@version]. It calls ValidateEventModel for the stored model. Without @version, it validates the latest version.
• The command uses the global --branch flag, so it validates the branch's view of the model.
• Text output prints a severity summary and one line per finding, in the same format as branch merge --dry-run. --format json gives event_model, validation_summary and validation.
• The command exits 1 when a finding is an error, and 6 when the model does not exist. A malformed address exits 5 before the CLI connects.
• Add the command to the CLI README and the exit-code reference.

Test

• Unit tests in trogon-atlas-client for the address parser.
• CLI integration tests: a model with an event that has no swimlane exits 1 and reports EVENT_NO_SWIMLANE (text and JSON). An empty model exits 0. A model written only on a branch validates with --branch and exits 6 on baseline.
• cargo test -p trogon-atlas-cli, cargo test -p trogon-atlas-client, and clippy with -D warnings on both crates pass.

Closes #93

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[cursor]

PR Summary

Low Risk
New read-only CLI path over an existing validation RPC; behavior mirrors other view commands with documented exit codes and tests.

Overview
Adds trogon-atlas validate <namespace>/<model>[@version] so CLI users can run model-level checks (storyboard, projection order, field provenance) via the server’s ValidateEventModel RPC—rules that apply --dry-run does not cover.

A new trogon-atlas-client::validate module parses the address, resolves “latest” when @version is omitted, and honors the global --branch header. The CLI prints a severity summary and findings (same style as branch merge dry-run); --format json returns event_model, validation_summary, and validation. Exit 1 on error-level findings; missing models still use 6; bad addresses fail with 5 before gRPC connect.

Docs note validate under exit code 1, and tests cover parser unit cases, in-process integration (including branch vs baseline), and local address validation without connecting.

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