fix(executor): version-gate the four doctypes that need Mendix 11.9

[ako]

The upstream nightly is red on 10.24 and 11.6.8 while 11.12, 11.13 and 11.14 are green (run 33846778362).

Cause

Four of the 29 mendixlabs#1018 documentation fixtures cover doctypes that do not exist below Mendix 11.9 — ai model, knowledge base, consumed mcp service, agent — and carried no version gate, so on an older project they failed at CREATE:

--- FAIL: TestDocumentation_SurvivesRewrite/ai_model
    create: create model requires Mendix 11.9.0+ (project is 11.6.8)

That failure says nothing about documentation carry. The doctype is simply absent — which is what a gate is for. These were the only failures in either job.

Reproduced, not reasoned about

mxbuild 11.6.0 is already cached locally and MX_BINARY pins it, giving the identical message and line in four seconds:

$ MX_BINARY=~/.mxcli/mxbuild/11.6.0/modeler/mx go test -tags integration ./mdl/executor/ -run 'TestDocumentation_SurvivesRewrite/(ai_model|agent)$'
    documentation_preserved_test.go:277: create: create model requires Mendix 11.9.0+ (project is 11.6.0)
FAIL

Both controls

	Result
11.6.0	4 SKIP, the other 25 run and pass, both control tests pass
11.13.0	no skips — all four actually run and pass

The second is the one that matters: a gate that always skipped would turn the whole matrix green while testing nothing, and nothing else would notice.

Note

The minimum is carried as a version on the case rather than a boolean, so the reason is legible where the case is written, and it mirrors sdk/versions/mendix-11.yaml (agent_model, agent_knowledge_base, agent_consumed_mcp_service, agent — all min_version: 11.9.0).

Incidental but useful: every other doctype passes untouched on 10.24 and 11.6.8, so the documentation carry itself holds across all three supported majors.

Finding recorded.

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