Add a Gitea Actions release workflow: lint/typecheck/format check -> build -> publish

Triggered on tags matching v*.*.* - runs the quality gate (lint,
typecheck, format:check, the existing test suite, build) as
individual steps for clear failure attribution, then publishes to
this Gitea instance's own npm registry (dev.pivoine.art, unscoped
package name - Gitea's npm registry supports that directly, no
@owner/ rename needed).

The release version comes from the git tag (v1.0.0 -> 1.0.0 via
`npm pkg set`), patched into package.json only in the CI run, never
committed back. publishConfig.registry in package.json is a static
string (safe to commit); the auth token is supplied at publish time
via NODE_AUTH_TOKEN, written to a CI-generated user-level .npmrc by
actions/setup-node's registry-url option rather than a repo-committed
one - pnpm >=10.34.2/11.5.3 (this repo pins 11.21.0) blocks ${VAR}
expansion in repository-controlled npmrc/pnpm-workspace.yaml
specifically to stop a malicious repo from exfiltrating CI secrets
that way, so the token can't live in a committed .npmrc at all.

Verified locally end-to-end short of the actual registry upload:
lint/typecheck/format:check/test/build all pass, and
`pnpm publish --dry-run --no-git-checks` after a temporary version
bump confirms publishConfig.registry resolves to the right URL and
prepack (next build) fires automatically as part of publish.

One-time manual setup this can't do by itself (documented in the plan
file): a repo-scoped Gitea Personal Access Token with the `package`
Read&Write scope, stored as the GITEA_PACKAGE_TOKEN repo secret -
Gitea's own auto-injected GITEA_TOKEN explicitly cannot publish
packages (unimplemented per Gitea's own docs).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -0,0 +1,38 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: https://github.com/actions/checkout@v4
+
+      - uses: https://github.com/pnpm/action-setup@v4
+        with:
+          version: 11.21.0
+
+      - uses: https://github.com/actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+          registry-url: https://dev.pivoine.art/api/packages/valknar/npm/
+
+      - run: pnpm install --frozen-lockfile
+
+      - run: pnpm run lint
+      - run: pnpm run typecheck
+      - run: pnpm run format:check
+      - run: pnpm run test
+      - run: pnpm run build
+
+      - name: Set package version from the tag
+        run: npm pkg set version="${GITHUB_REF_NAME#v}"
+
+      - name: Publish to Gitea npm registry
+        run: pnpm publish --no-git-checks
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.GITEA_PACKAGE_TOKEN }}