hemx/work/slices/SLICE-0008-cross-file-build-facts.md

id, type, status, parent, title, refs

id	type	status	parent	title	refs
SLICE-0008	slice	ready	NS-0002	Surface cross-file facts without replacing build validation	REQUIREMENTS.md docs/editor-support.md docs/diagnostics.md hemx-build/src/lib.rs hemx-lsp/src/main.rs

Objective

Define and prove the handoff between editor-visible template facts and cargo check/hemx-build completeness checks for template/handler references.

Authority

REQUIREMENTS.md check/001, check/003, diagnostics/004, and diagnostics/005 require cross-file references visible to build validation to fail at cargo check with useful spans, while editor overlays remain optional glue.

Close when

• A test fixture demonstrates a template/handler reference that editor diagnostics can surface and cargo check/build validation also rejects.
• The LSP path reports useful spans without becoming the global source of truth.
• Global completeness boundaries remain component-scoped unless mount/tests are needed.

Verification

• cargo test -p hemx-lsp
• cargo check --workspace or a focused compile-fail/build fixture when build validation changes.

Non-goals

• Do not make the LSP own Rust type checking.
• Do not create a persistent project index unless a later slice proves it is required.

Evidence

docs/diagnostics.md and hemx-build diagnostics define the authority boundary that editor support must reflect.