Fail loud on a dropped #oss-alerts page: the failure-alert cross-post no longer
swallows a 200/ok:false Slack response, so a dropped page-the-humans alert reds
the renderer job instead of vanishing on a green run. The thread reply stays
warn-only. Both posts capture the response via a shared slack_alert_posted_ok
predicate, mirrored byte-identically across the live workflow and the dry-run
helper.
Debt cleanup: drop a dead failed_count var, correct a misleading gha_url comment,
and validate the decoded blob run_id against ^[0-9a-f]{6}$ in the render step so
a malformed run_id can't reach Slack or the run name.
Tests: predicate edge cases (non-JSON, malformed, missing/null ok), an anti-drift
parity guard asserting the predicate is identical in both files, and call-site
tests locking the #oss-alerts fail-loud vs thread warn-only exit semantics.
Promote-notify Slack message: name the promoted AND failed services (one
Failed: header + bullets), legible "(N): <names>" count, real wall-clock
elapsed (integer-coerced), and drop the constant verify-prod legend line.
Durable healthcheckPath: track it per-service/env in the SSOT (railway-envs),
re-assert it on the promote pin path (omit-when-absent, never null), and route
deploy-to-railway provisioning through isTrackedService/resolveProvisionHealthcheck
so a tracked-null service omits the healthcheck while an untracked one keeps the
/api/health default — fixing the silent prod-healthcheck drift that refused aimock.
Tests: ruby pin-reassert spec + deploy-to-railway healthcheck spec + emit/golden/accessor.
Adds .github/workflows/showcase_promote_notify.yml — workflow_dispatch-only
Slack notify workflow for promote results. Posts initiation + threaded reply
to #team-showcase; cross-posts to #oss-alerts on partial/total failure.
Also adds showcase_promote_notify.dry-run.sh — a local render-logic mirror
that decodes the same payload and prints the messages the workflow would
send to Slack, without making any Slack API calls. Used by the pre-merge
runbook and by future CI fixture tests.
Jordan Ritter