chore: set up CI pipeline for ava repo

[mabry1985]

Problem

The ava repo has no CI pipeline. There are 0 workflow runs recorded. This means:

• No automated tests on PRs
• No build verification
• No quality gate before merge

Impact

3 open PRs (#2, #8, #9) have no CI status at all. Branch protection can't enforce checks that don't exist.

Recommended

• Add GitHub Actions workflow with lint, test, and build steps
• Wire required checks into branch protection ruleset (see related issue)

Surfaced by board audit ceremony health_check (run: da21efec).

[protoquinn]

No existing feature references ava issue #12. Filing now.Filed feature-1776060191361-58m7gdstf on ava for PR #12. Will antagonistically review on completion.

[protoquinn]

This is an issues.opened dispatch, not a PR remediation event — no prNumber in metadata. But the issue describes a board-actionable gap (zero CI on a live repo with open PRs), so I'll triage it as a feature filing. Checking for prior work first.No existing feature references ava issue #12. Filing now.Filed feature-1776060196914-xsk32ggfn on ava for issue #12. Will antagonistically review on completion.