Make the lint-prod audit result legible without having to click into the
workflow logs. Two surfaces, both rendered from the same JSON payload:
1. `$GITHUB_STEP_SUMMARY` — structured markdown block at the top of every
workflow run page. Shows on every event (push, pull_request,
workflow_dispatch).
2. Sticky PR comment — one comment per PR, keyed by the HTML marker
`<!-- lint-prod-sticky-comment -->`. Re-runs update the same comment via
`gh api -X PATCH` instead of creating duplicates. Plain `gh` CLI only,
no third-party action.
Both surfaces show: one-line status, a table of the unpinned services only
(not all 27), and a Pacific-time run timestamp with the finding count.
To support the renderer, add `--format json` to `lint-prod`:
{services:[{name,source,status}], findings:N, timestamp:"ISO8601"}
The workflow consumes this shape and also writes `findings` to
`$GITHUB_OUTPUT` so downstream jobs (future Slack alert) can compare runs.
Idempotent: re-running the workflow finds the existing comment by marker
and PATCHes it — never duplicates.
Add --exit-zero flag to bin/railway lint-prod that makes the command exit 0
even when digest-pinning findings exist. Findings still print to stdout so
they remain visible in the CI step log.
Wire the showcase_lint_prod.yml workflow to pass --exit-zero so the job
cannot block PRs while we soak the check against real production state.
Once we have confidence the findings are clean, remove --exit-zero from
the workflow step to flip lint-prod to enforcing.
Updates README to document the advisory-mode behavior and the path to
flipping the check to enforcing.