Delete upstream workflows

This fork does not ship upstream's releases, and its hosted-runner jobs
never start here.

Claude-Session: https://claude.ai/code/session_01HuMDfgFssPUptYUzgZ6Cp8

.github/workflows/integrate.yml

@@ -1,16 +0,0 @@
-# main only
-
-name: Integrate
-
-on:
-  push:
-    branches: [main]
-
-env:
-  FORCE_COLOR: 1
-
-jobs:
-  _:
-    uses: medikoo/github-actions-workflows/.github/workflows/0.12-integrate.yml@main
-    secrets:
-      USER_GITHUB_TOKEN: ${{ secrets.USER_GITHUB_TOKEN }}

.github/workflows/publish.yml

@@ -1,18 +0,0 @@
-# Version tags only
-
-name: Publish
-
-on:
-  push:
-    tags:
-      - v[0-9]+.[0-9]+.[0-9]+
-
-env:
-  FORCE_COLOR: 1
-
-jobs:
-  _:
-    uses: medikoo/github-actions-workflows/.github/workflows/publish.yml@main
-    secrets:
-      USER_GITHUB_TOKEN: ${{ secrets.USER_GITHUB_TOKEN }}
-      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/validate.yml

@@ -1,14 +0,0 @@
-# PR's only
-
-name: Validate
-
-on:
-  pull_request:
-    branches: [main]
-
-env:
-  FORCE_COLOR: 1
-
-jobs:
-  _:
-    uses: medikoo/github-actions-workflows/.github/workflows/0.12-validate.yml@main