Preserve microflow type and cardinality inference during rebuild

[hjotha]

Part of #332. Related to #199. Staged in draft PR #346.

Summary

Several roundtrip validity failures come from missing type/cardinality inference in microflow rebuilds. When the builder cannot infer whether a value is an object, list, association reference, or mapped response, it can write valid-looking MDL that becomes an invalid MPR.

Expected behavior

The builder/writer should preserve MPR validity for:

• compact association retrieve sources;
• sort attributes that require indirect entity refs;
• Java action return types, including generic list/object returns where inferable;
• import mapping result cardinality;
• list operations and add <expression> to $List values;
• inferred return values for non-void microflows.

Current staging status

Draft PR #346 contains several type/cardinality inference fixes. These need to be extracted as focused PRs by root cause, preferably starting with cases that do not add new MDL syntax.

Validation target

Focused PRs should include synthetic unit tests for each inference case and pass make build, make lint-go, and make test.

[github-actions]

Issue Triage

Summary:
The issue requests improvements to mxcli’s microflow rebuild logic so that type and cardinality information is correctly inferred and preserved, preventing invalid MPR output.

Checklist (feature request):

• ✅ Use case – described (round‑trip validity failures due to missing inference).
• ✅ Proposed syntax/behavior – listed (compact association retrieve sources, sort attributes, Java action return types, import mapping result cardinality, list operations, inferred return values).
• ❌ Mendix version relevance – not specified (e.g., whether the problem occurs in specific Mendix versions or affects all supported versions).

What’s missing:
Could you please clarify which Mendix version(s) this issue affects, or note if it is version‑agnostic? This helps us prioritize and test the fix appropriately. Thank you!

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