Implement Gitea Actions runner substrate

runner/README.md

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+# Runner Templates
+
+This directory contains non-secret templates for the first forge-owned Gitea
+Actions runner.
+
+Use `docs/gitea-actions-runner-substrate.md` as the authoritative runbook. The
+templates here are intentionally examples because the final host paths,
+installer, and generated `act_runner` config must come from the attended runner
+host.
+
+Files:
+
+- `act-runner.env.example` documents the non-secret environment shape and the
+  approved token file reference.
+- `act-runner.service.example` is a systemd service skeleton for a binary
+  `act_runner` installation.
+- `act-runner.openrc.example` is an OpenRC service skeleton for Alpine-style
+  hosts such as haskelseed.
+- `act-runner-haskelseed.openrc.example` matches the current haskelseed
+  registration layout, where `/root/.runner` already exists and `act_runner`
+  runs from `/root`.
+
+Do not commit `.runner`, generated configs containing host-specific state, token
+files, logs with secret material, or downloaded runner binaries.