fix(renovate): expand GitHub Action pins to semver tags

[Copilot]

Renovate was preserving major-only action version comments such as # v6 when SHA-pinning GitHub Actions, which triggers Zizmor findings. A previous attempt also caused noisy digest-only updates that changed only SHAs without expanding tags.

• Renovate presets

  • Switch GitHub Actions pinning from helpers:pinGitHubActionDigests to helpers:pinGitHubActionDigestsToSemver.
  • Remove the broad top-level pinDigests: true from the shared base preset to avoid digest-only noise outside the intended helper behavior.

• Shared config + docs

  • Update the config-sync Renovate template to use the semver-expanding helper.
  • Keep the architecture documentation aligned with the recommended preset.

Example intended behavior:

uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.4.0

Instead of leaving the comment at a major-only tag such as # v6.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• docs.renovatebot.com
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
• plugins.dprint.dev
  • Triggering command: /home/REDACTED/.npm/_npx/e94364357ee2fa87/node_modules/.bin/dprint dprint check --config config-sync/files/dprint.json docs/architecture.md --local --get ules/dtrace-provider/node_modules/.bin/python3 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)