fix(ci): replace sergeysova/jq-action@v2 with inline jq

[jbiskur]

Summary

• sergeysova/jq-action@v2 uses alpine:3.11 as its Docker base, and the Alpine 3.11 mirrors started returning network errors between 2026-04-14 and 2026-04-15, breaking every workflow run that used this action.
• All three workflows (build.yml, validate.yml, release-please.yml) use the action only to read one field out of deno.json. Replace it with a plain jq call captured into GITHUB_OUTPUT. jq is available by default on the blacksmith-4vcpu-ubuntu-2204 runners, so no extra setup.
• This unblocks the release PR chore(main): release 3.1.0 #210 (v3.1.0 for the new PolicyValidateCommand) which is currently failing its Test workflow on the same broken step.

Test plan

• CI validate workflow green on this branch
• After merge, release-please refreshes PR chore(main): release 3.1.0 #210 and its Test workflow passes
• v3.1.0 publishes successfully

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f0fc1f0c-6ddd-415f-81c9-9567666e074f

📥 Commits

Reviewing files that changed from the base of the PR and between e9062ba and 90e2d0a.

📒 Files selected for processing (3)

• .github/workflows/build.yml
• .github/workflows/release-please.yml
• .github/workflows/validate.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/replace-jq-action-with-inline-jq

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