chore: remove unused demo projects (#160)

* chore(workflow): upgrade npm CLI for trusted publishing OIDC support

The 0.0.2 publish workflow run failed with 'error retrieving identity
token' on @ngaf/licensing and @ngaf/partial-json, and a 404 on
@ngaf/a2ui. Root cause: actions/setup-node@v6.3.0 with node-version: 22
ships npm 10.9.2, which has partial OIDC code paths but doesn't fully
implement the trusted-publishing flow against npm registry's OIDC
endpoint.

npm 11.5.1+ is required for trusted publishing. Adding 'npm install -g
npm@latest' before the publish step bumps the runner to a current
release.

Sources:
- https://philna.sh/blog/2026/01/28/trusted-publishing-npm/
- npm/cli#8730
- https://docs.npmjs.com/trusted-publishers/

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* ci: expand Library job to cover all 7 publishable libs

Previously only verified @ngaf/langgraph on each PR. A regression in
chat, ag-ui, render, a2ui, partial-json, or licensing could land
unnoticed. Switch to nx run-many across the publishable group.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* chore: remove unused demo projects

* ci(minting-service): disable preview deployments

* chore: retrigger checks after minting preview disable

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: blove

AGENTS.md

@@ -40,7 +40,6 @@ This file is for agents working in this repository. It is contributor-facing, no
 - `apps/website`: docs and marketing site.
 - `packages/mcp`: MCP server package (`@ngaf/langgraph-mcp`).
 - `e2e/agent-e2e`: end-to-end coverage for the workspace.
-- `apps/demo` and `apps/demo-e2e`: demo application and related end-to-end coverage.
 
 ## Working in This Repo