Preserve manual while-true retry-loop roundtrips

[hjotha]

Part of #332. Staged in draft PR #346.

Summary

Manual retry-loop style graphs can be described as while true with continue/terminal paths. The current rebuild path can add a fallthrough EndEvent or fail to preserve a loop when only nested bodies contain break/terminal paths.

Expected behavior

describe -> exec -> describe should preserve manual while/retry-loop semantics, including:

• loop-back flow without an extra fallthrough EndEvent;
• nested-loop break that belongs to the nested loop, not the outer manual loop;
• terminal branches inside the loop body;
• valid MPR output after roundtrip.

Current staging status

The relevant code exists in draft PR #346 but depends on umbrella-only manual loop reconstruction. It should be extracted with that reconstruction rather than as the tiny follow-up alone.

Validation target

Focused PR should include synthetic tests for manual loop preservation and pass make build, make lint-go, and make test.

[github-actions]

Issue Triage

Summary:
The issue requests that mxcli preserve manual “while‑true” retry‑loop semantics when rebuilding Mendix projects, ensuring loops are not broken by spurious EndEvents, nested breaks stay scoped correctly, and the round‑trip yields valid MPR output.

Checklist for feature request

Required info	Present?	Notes
Use case – why the feature is needed / what problem it solves	❌	Implied but not explicitly stated.
Proposed syntax or behavior (if applicable)	✅	Described as preserving while true with continue/terminal paths, loop‑back flow, nested break, etc.
Mendix version relevance (if version‑specific)	❌	No mention of which Mendix versions are affected or targeted.

Polite request for missing information

Hi there! Thanks for opening this issue. To help us evaluate and prioritize the request, could you please add:

1. Use case: A brief description of the scenario where losing the retry‑loop semantics causes trouble (e.g., a specific MDL pattern, a CI/CD step, or a user workflow that fails after a round‑trip).
2. Mendix version relevance: Whether this applies to all Mendix versions you support, or if it’s specific to certain releases (e.g., 9.x, 10.x).

Once we have those details, we’ll be able to move forward. Thanks!

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