chore(agent-runner): adopt eslint-config-agent (recommended-incremental)

[tupe12334]

Closes #101

What

agent-runner/ is the only JavaScript in this repo and had no ESLint setup at all — agent-runner/src/index.js was never linted. This wires in the shared eslint-config-agent config.

There was no prior config to migrate; this is a from-zero adoption.

Changes

File	Change
agent-runner/package.json	add eslint, eslint-config-agent, globals devDeps + a lint script
agent-runner/eslint.config.js	new — wires in eslint-config-agent/recommended-incremental
agent-runner/pnpm-lock.yaml	new — lockfile for the added devDeps
agent-runner/pnpm-workspace.yaml	new — pins pnpm's allowBuilds decisions (see below)
.gitignore	ignore node_modules/ (the existing file is Rust-oriented)

src/index.js is not modified — no behaviour change, no Rust code touched, no CI workflow touched.

Preset choice

Starting on eslint-config-agent/recommended-incremental (divisive strict rules disabled, everything else downgraded to warning). On this file that is 45 warnings, 0 errors, so pnpm lint exits 0 rather than landing a large behaviour-changing diff up front. The backlog is mostly no-console on the server's startup/lifecycle logging, unicorn/prevent-abbreviations on req/res/err, no-restricted-syntax on direct process.env access, and JSDoc formatting — all worth burning down separately, after which the preset can be promoted to recommended or the strict default.

Two small config accommodations, both commented inline:

• Node globals. The shared config assumes browser globals, which would leave process/Buffer/console undefined under no-undef in this server.
• react.version pinned. The shared config leaves eslint-plugin-react on "detect"; with no React installed here, detection fails and prints a warning on every run. No React rules actually apply.

pnpm-workspace.yaml is needed because pnpm 11 fails pnpm install with ERR_PNPM_IGNORED_BUILDS unless the transitively-pulled build scripts get an explicit decision. All three are declined — none is needed for linting.

Verification

Run locally from agent-runner/ against a clean node_modules:

• pnpm install → exit 0
• pnpm lint → exit 0 (45 warnings, 0 errors)
• smoke test: node src/index.js still boots and POST /delegate still returns {"accepted":true,...}

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Opened by the "Scout & wire eslint-config-agent adoption → Slack" moadim routine.