Adopt docs-2026.2, and take the language service's examples from it

[samuelduchesne]

Closes T015.

The gap

The two TypeScript examples on the language service page were authored here, where nothing checks them. This repository checks Python with pyright, and the one TypeScript tree it does check, docs/snippets/js/, is vendored byte for byte from a docs-YYYY.N release of idfkit-js and is never hand-edited.

So a rename in @idfkit/language would have left the published page showing code that compiles in nobody's checkout, and a reader would have found out first.

What changes

idfkit-js#43 moved them into docs-snippets/, where tsconfig.docs.json compiles them against the published surface rather than the sources. docs-2026.2 ships them. This vendors that release and repoints the page's eight includes:

docs/snippets/explanation/idf_language_service.ts
-> docs/snippets/js/explanation/idf-language-service/the_five_answers.ts
docs/snippets/explanation/idf_language_service_translation.ts
-> docs/snippets/js/explanation/idf-language-service/translating_to_a_protocol.ts

The hand-authored copies are deleted rather than left to rot beside the checked ones.

Verified, not assumed

• All four regions each file needs are present in the vendored copy.
• The strict build renders eight code blocks, none empty — a wrong region name would have produced silence rather than an error.
• sync_js_artifacts.py --check confirms the tree matches docs-2026.2.
• check_page_kinds.py and check_capability_declarations.py both pass.

Also in this diff

docs/snippets/js/explanation/two-writers-one-model/controls.ts, added to idfkit-js after docs-2026.1, and a refreshed typedoc.json. Both arrive because the reference and the examples are pinned on one tag, so they always describe the same commit.

Levels

[tool.idfkit.docs] moves to docs-2026.2. The conformance, governance and library levels do not.

Pre-existing, unrelated

make check is red on main too: ruff reports S310 in scripts/sync_js_artifacts.py, untouched here. And [tool.idfkit.library] is still 0.15.0, which lacks names its own merged pages document.

[github-actions]

Docs preview for this PR is available at:
https://developers.idfkit.com/pr-preview/pr-5/

Changed pages:

• https://developers.idfkit.com/pr-preview/pr-5/explanation/idf-language-service/