CI: credential-free build jobs, trust jobs that never build

Every job that runs third-party code (restore, build, tests, npm ci, next build,
wix) now holds only a read-only token and hands its output on as one archive.
Signing, publishing and deploying happen in separate jobs on a fresh runner that
run only this repository's scripts and pinned actions, unpack artifacts outside
the checkout and take no build-job output into a script.

- build-agent: reserve -> build -> release
- build-msi: sign-loader -> build -> release
- deploy-backend: reserve -> build -> deploy (publish output as one tar.gz)
- deploy-web: build -> deploy (SWA token only, no id-token) -> record
- combine-rules: validate (read-only, PRs too) -> publish (push to main only)
- deploy-mcp: same shape; documents docker build as its boundary

Deploy-only jobs run in the production environment. The jobs that sign stay
without an environment for now: a job carries one OIDC subject, and the signing
identity still trusts the ref. oidc-login-test.yml is removed; combine-rules no
longer triggers on the dev branch.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/codeql.yml

@@ -37,7 +37,6 @@ on:
       - '.github/workflows/deploy-mcp.yml'
       - '.github/workflows/deploy-web.yml'
       - '.github/workflows/indexnow-notify.yml'
-      - '.github/workflows/oidc-login-test.yml'
       - '.github/workflows/pester.yml'
       - '.github/workflows/publish-scripts.yml'
   pull_request:
@@ -69,7 +68,6 @@ on:
       - '.github/workflows/deploy-mcp.yml'
       - '.github/workflows/deploy-web.yml'
       - '.github/workflows/indexnow-notify.yml'
-      - '.github/workflows/oidc-login-test.yml'
       - '.github/workflows/pester.yml'
       - '.github/workflows/publish-scripts.yml'
   schedule: