Add agentic issue triage (gh-aw) with native issue intents

[alondahari]

What & why

This is a new installation of gh-aw agentic issue triage on primer/css. On every issue opened / reopened, an agent reads the issue and its comments and helps maintainers act quickly: it classifies the issue type when unset (Bug / Feature / Task — the org's native issue types), adds only existing, relevant labels (type:*, area:*, needs more info), checks for likely duplicate/related issues, and asks the author for missing information only when needed.

It uses issue intents so the agent attaches its reasoning to each action (issue type, labels) and surfaces a confidence level, so maintainers can see why a change was made and approve or reject low‑confidence suggestions instead of having them applied silently. A key goal is to minimise the noise of agent‑generated comments — rationale and confidence travel with the action itself rather than as separate comments, and there is no routine triage report. Learn more: Review and approve Copilot agent actions on issues.

See it in action

issues.agentic.review.mp4

Changes

This is a fresh install (the repo had no .github/workflows/*.md AW workflow), configured conservatively for this repo:

• New workflow .github/workflows/issue-triage.md + compiled issue-triage.lock.yml.
• Native safe outputs only — set_issue_type and add_labels with built‑in rationale/confidence/suggest. No custom GitHub API jobs.
• No set_issue_field — primer/css tracks effort/impact as labels, not repo issue fields, so no field mutations are added.
• Preserves existing labels (add‑only), never auto‑closes issues, and calls noop when no visible change is needed.
• Repo variable GH_AW_RUNTIME_FEATURES=issue_intents — set (wires the native intent path).
• Includes the shared gh‑aw runtime scaffolding: .github/aw/actions-lock.json (action‑lock), .github/agents/, .github/skills/, .gitattributes, and the auto‑generated agentics-maintenance.yml + copilot-setup-steps.yml.
• Validated with a trial run against a real closed issue — see below.

Trial validation

Ran gh aw trial in logical mode (capture‑only, no mutation of the live repo) against closed issue primer/css#3052, hosted in github/lukewar-gh-aw-trial:

• Run: https://github.com/github/lukewar-gh-aw-trial/actions/runs/30002395162
• Captured safe outputs:
  • set_issue_type → Bug (confidence HIGH) — "reproducible SCSS compilation failure due to @primer/primitives version mismatch breaking import paths."
  • add_labels → type: bug 🐞 (HIGH) and migration (HIGH), each with a rationale.
  • No comment, no close — minimal noise, as intended.

Trial mode runs in capture mode — safe outputs are recorded, not applied — so it proves the auth / engine / checkout / safe‑output plumbing. The on‑issue rationale/confidence UI becomes visible on the first real run once the workflow is enabled.

Rollout

Part of the AW agentic triage rollout — github/plan-track-agentic-toolkit#467. Linking (not closing): no per‑repo sub‑issue exists for primer/css.

Any required feature flags are enabled org‑wide for the github org and handled by the onboarding team; nothing is needed from repo maintainers here.

/cc @jonrohan for review.

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[alondahari]

Closing because this PR was created from a superseded target list; no Primer component repositories are in scope for the stable gh-aw refresh.

[alondahari]

Superseded by #3118 (rebuilt on stable gh-aw v0.82.14). This PR's branch was deleted during a scope correction, so GitHub can't reopen it — continuing in #3118.