docs(hemx): add diagnostics guide

Document the v1 diagnostics story for common template, derive, form, result-handler, and runtime/deploy mistakes. The guide names expected user-facing diagnostics and recurring verification gates without exposing raw ids/selectors as the beginner path.

req: diagnostics/001

req: diagnostics/002

req: diagnostics/003

req: failure/004

req: failure/005

req: public_api/005

req: test/003
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slhx agent
2026-06-05 09:46:32 +02:00
parent bf6add03ef
commit c8c71deb68
2 changed files with 79 additions and 1 deletions
+3 -1
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@@ -54,7 +54,9 @@ user-authored Rust form type, so domain newtypes such as `Email`, `TodoId`, and
Use validation effects for expected user mistakes, and `Result<impl IntoEffect,
E>` for fallible domain, database, or infrastructure work. Integration crates map
`E` to generated UI effects, redirects, events, or HTTP responses; the canonical
app code still uses the same handler shape for plain and fallible handlers. req: failure/004 req: derive_handler/004
app code still uses the same handler shape for plain and fallible handlers. See
`docs/diagnostics.md` for common compile/build/runtime mistakes and fixes.
req: failure/004 req: derive_handler/004
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