docs: bound optional heml editor overlays

Make hemx-build diagnostics and the documented .heml syntax surface the authority for any editor overlay, while rejecting a second template language, selector model, formatter, or custom editor framework.

req: diagnostics/004
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slhx agent
2026-06-12 18:15:30 +02:00
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@@ -675,6 +675,9 @@ what a valid business email is.
### req: diag/003
003 Internal terms (`ResourceId`, `ScopeKey`, `EffectBatch`) must not appear in beginner-facing diagnostics unless `--verbose` is enabled.
### req: diag/004
004 Optional `.heml` editor overlays must treat `hemx-build` diagnostics and the documented `.heml` syntax surface as authority; they may present compiler-shaped diagnostics, completion, hover, and navigation, but must not own a second template language, formatter, selector model, or custom editor framework. [north_star]
---
## test