docs(work): map testing and editor northstars

Add repo-local northstars and ready slices for testing strategy, LSP/editor completion, and hemplate highlighting boundaries.

work/slices/SLICE-0012-editor-packaging-blocker.md

@@ -0,0 +1,38 @@
+---
+id: SLICE-0012
+type: slice
+status: blocked
+parent: NS-0003
+title: Package editor highlighting integrations
+refs:
+  - docs/editor-support.md
+  - README.md
+---
+
+## Objective
+
+Ship `.heml` highlighting into specific editors only after repo-owned syntax/query behavior exists and release authority is explicit.
+
+## Authority
+
+`docs/editor-support.md` names VS Code, Cursor, and Neovim setup, but current repo authority does not grant external marketplace/package publishing from this work-graph mapping goal.
+
+## Close when
+
+- The target editor/provider is named.
+- The package owner, signing/publishing credentials, and release process are explicit.
+- The provider package consumes repo-owned query/fixture facts rather than becoming a separate syntax authority.
+
+## Verification
+
+- Provider-specific install/manual smoke, named by the future implementation slice.
+- Repo-owned query fixture tests from `SLICE-0011` remain green.
+
+## Non-goals
+
+- Do not publish marketplace packages or mutate external editor registries under the current authority.
+- Do not fork syntax behavior per editor.
+
+## Evidence
+
+This is intentionally blocked by missing external release authority, not by an implementation guess.