feat(flue): Add shared issue triage workflow

[dcramer]

Adds a reusable Flue issue triage workflow in getsentry/.github so target repositories can call one shared Sentry Intern triage implementation instead of carrying local Flue code. The workflow also keeps a manual workflow_dispatch path that points at a specific issue for a real smoke test.

Sentry Intern Triage

The Flue agent enforces a first-sentence Sentry Intern identity in comments, keeps the casually professional triage voice in the skill, and inherits not-planned closure when the canonical duplicate was closed that way. Automatic duplicate closure is limited to same-repository candidates; cross-repository matches now fall back to human review.

Repository Gate

A central feature registry enables issue triage for getsentry/cli, getsentry/dotagents, getsentry/junior, getsentry/sentry-mcp, getsentry/vitest-evals, and getsentry/warden. Reusable workflow calls must target their own getsentry repository, and the workflow checks the feature registry before creating the GitHub App token or checking out the target repository.

Workflow Contracts

The workflow validates required Flue secrets and variables before creating the Sentry Intern token, scopes the app token to issues write on the target repository, and uses the caller GITHUB_TOKEN for source checkout. pnpm setup reads automation/package.json so the pinned action can resolve the packageManager field from the checked-out automation repo, and the Flue agent now treats missing or invalid prepared checkouts as unavailable instead of trusted.

Local Tooling

Adds repo-local Prettier, actionlint, lint-staged, and simple-git-hooks wiring so workflow and formatting checks can run with pnpm before commit. The actionlint wrapper handles both full-repo runs and lint-staged file lists.

Validation

Validated with pnpm run lint, lint-staged against the PR diff, focused Vitest coverage, Flue node build, YAML parsing, allowlist accept and reject checks, pinned action tag checks, git diff whitespace checks, and the PR check suite.

[dcramer]

if this ends up too painful i going to just set it up as a service, and bind a workflow here that calls a custom action

[cursor]

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