Fail daily AIC guardrail as workflow error and rename ET guardrail wiring to daily_ai_credits_*

[Copilot]

The daily per-workflow AI Credits guardrail was signaling exceedance as a warning and allowing confusing artifact download warnings to dominate logs, which made guardrail trips easy to miss. This change promotes guardrail exceedance to an explicit workflow failure with actionable guidance and aligns generated/runtime naming with AI Credits terminology.

• Guardrail exceedance is now a hard failure

  • check_daily_aic_workflow_guardrail.cjs now emits core.error(...) and core.setFailed(...) when 24h AIC exceeds threshold.
  • Failure message includes a docs link to cost-management guidance.

• Suppress misleading artifact-not-found noise

  • Artifact download “not found” during historical run inspection is now treated as a non-actionable skip path (diagnostic info log), not a warning/error.
  • Prevents false-positive “unable to download artifact” error surfacing when no real workflow failure occurred.

• Rename generated and runtime guardrail wiring

  • Replaced daily_effective_workflow_* outputs/conditions/env wiring with daily_ai_credits_* across compiler output wiring, activation/main/conclusion conditions, failure-handler context keys, and golden fixtures.
  • Updated corresponding env vars from GH_AW_DAILY_EFFECTIVE_WORKFLOW_* to GH_AW_DAILY_AI_CREDITS_*.

• Failure-report templates and context keys updated

  • Updated agent failure template placeholders/context names and daily guardrail explanatory copy to reference daily_ai_credits_*.

if (totalAIC > threshold) {
  const exceededMessage =
    `Daily workflow AIC guardrail exceeded for ${workflowName}: ${totalAIC}/${threshold}. ` +
    `See https://github.github.com/gh-aw/reference/cost-management/`;
  core.error(exceededMessage);
  core.setFailed(exceededMessage);
}

[pelikhan]

This guardrail failure needs to be propagated to the conclusion job that files an issue. If you want to fail a job, it should be the conclusion after filing the issues. Let's talk about this one.

[pelikhan]

This will skip the conclusion job that files the issue.

[pelikhan]

Carving a sub PR for renames so we split this change

https://github.com/github/gh-aw/tasks/f1cc7421-a69e-4df3-afb1-e3e43ce8fa4f

[pelikhan]

See #38611

[pelikhan]

https://github.com/github/gh-aw/tasks/53838753-2728-423f-8783-185715175380

[pelikhan]

Implemented.