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feat(diagnostics): add compiler-backed heml language service

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Add hemx-lsp for stdio LSP diagnostics, completion, and hover while preserving HTML editor tooling for .heml files. Teach hemx-build to expose generated target and derive-known template context facts, including simple h-for locals, so editor help comes from build-owned facts instead of editor-only parsers. Wire VS Code/Cursor and Neovim documentation and extend the Workout exemplar with a real h-for plan loop for end-to-end proof.

req: diag/004

req: diag/005

req: diag/006
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slhx agent
2026-06-22 22:06:42 +02:00
parent 4bca046ed1
commit 797132647f
15 changed files with 1886 additions and 14 deletions
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AGENTS.md
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@@ -57,7 +57,7 @@ Keep it stable. Prefer pointers to canonical sources over copied structure, file
- Use `cargo run -p hemx-xtask -- app new PATH` for the generic page/form/keyed-row/notice starter, and `cargo run -p hemx-xtask -- app new --mobile PATH` for the phone-first starter with host capabilities, recovery truth, and release-kit commands. req: ceremony/005 req: ceremony/006
- The public component-reuse explanation lives in `docs/recipes/reusable-partials.md`; do not grow a client component framework to explain partial composition.
- The stable public `.heml` authoring surface lives in `docs/hemplate-syntax.md`; Hemlate examples must use that real hemplate syntax, not Vue/Handlebars sketches.
- Optional `.heml` editor overlays must share authority with `hemx-build` diagnostics and `docs/hemplate-syntax.md`; do not create a second template language, selector model, formatter, or custom editor framework. req: diagnostics/004
- Optional `.heml` editor overlays must share authority with `hemx-build` diagnostics and `docs/hemplate-syntax.md`; `hemx-lsp` owns editor protocol glue for diagnostics/completion/hover and derive-known template facts, while VS Code/Cursor/Neovim keep normal HTML/tree-sitter tooling. Do not create a second template language, selector model, formatter, Rust type system, or custom editor framework. req: diagnostics/004 req: diagnostics/005 req: diagnostics/006
- JS runtime changes must preserve root-scoped lookup and avoid selectors, VDOM, expressions, and per-node listeners.
- Host capability adapters must stay at the `hemx-host` boundary: they may call host APIs and return host events, but they must not mutate DOM or own app/domain state. req: host/002
- Local/offline app behavior should be commands/events/projections; do not add `hemx-local`, stored DOM patches, or stored `EffectBatch` truth without a proven reusable contract. req: local/001 req: local/002