ci(docs): bundle TypeDoc into Antora docs, drop GitHub Pages and Vercel

[johnymontana]

Why

The docs-typedoc.yml workflow was failing on every run: it deployed the
TypeDoc API reference to GitHub Pages, but Pages is not enabled for this repo
(configure-pages → 404). Separately, the Vercel project that served the
Antora docs has been removed, leaving docs/vercel.json and related docs
stale. The docs site is published by the neo4j-contrib/labs-pages build,
which consumes this repo's committed Antora component.

What changed

TypeDoc ships inside the Antora component

• typescript/typedoc.json now outputs to
  docs/modules/ROOT/attachments/api/typescript/. Antora publishes the
  attachments/ family verbatim, so the API reference travels with the rest
  of the docs through the labs-pages build — no separate hosting.
• The generated output (138 files, ~2.1MB) is committed and no longer
  gitignored (removed the stale typescript/docs-api/ entry).
• docs-typedoc.yml rewritten: on pushes to main touching
  typescript/src** it regenerates the TypeDoc, commits the result to main
  as github-actions[bot] (only when output changed), and dispatches the
  labs-pages rebuild directly — the explicit dispatch is required because
  pushes made with GITHUB_TOKEN do not trigger trigger-labs-build.yml.
  Reuses the existing LABS_PAGES_TOKEN secret. The typescript-v* tag
  trigger was dropped (the workflow must commit to main; release version
  bumps touch typescript/package.json on main and trigger it anyway).

Link fixes

• reference/typescript-api.adoc and sdks/typescript.adoc now link via
  {attachmentsdir}/api/typescript/... instead of neo4j-labs.github.io.
  The old deep links were doubly broken: Pages aside, TypeDoc emits
  module-prefixed filenames (classes/index.MemoryClient.html, not
  classes/MemoryClient.html). Every link is verified against the actual
  generated files in a full local Antora build.
• typescript/README.md and CHANGELOG.md now point at
  neo4j.com/labs/agent-memory/reference/typescript-api.

Vercel removal

• Deleted docs/vercel.json. There were no Vercel deploy workflows — the
  deploy ran through the (already disconnected) Vercel Git integration. The
  vercel-ai jobs in ci-typescript.yml / publish-nams-ai-provider.yml
  are the Vercel AI SDK provider package, not deployment, and are
  untouched.
• Updated stale references: CLAUDE.md deployment section now describes the
  labs-pages flow; CONTRIBUTING.md workflow table updated.

Verification

• npm run docs:api generates into the attachments dir cleanly
  (0 errors, 11 pre-existing warnings).
• Full Antora build publishes _attachments/api/typescript/ and all rendered
  links resolve to real files.
• make test-docs-links test-docs-build: 17/17 passed.

Notes for reviewers

• The workflow commits generated HTML to main. This is inherent to the
  approach: labs-pages reads the committed git tree, so generated output must
  live in it. Expect a bot commit after merges that touch typescript/src/**.
• Labs rebuild dispatch depends on the existing LABS_PAGES_TOKEN secret
  (same dependency as trigger-labs-build.yml).

[prakriti-solankey]

LGTM