feat: add runner conversion scripts and strengthen cutover automation

runners-conversion/augur/envs/augur.env.example

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+# augur.env — Per-repo runner configuration for the augur repository.
+#
+# Copy this file to augur.env and fill in your values:
+#   cp envs/augur.env.example envs/augur.env
+#
+# To add another repo, copy this file to envs/<repo>.env, adjust the values,
+# and add a matching service block in docker-compose.yml.
+
+# Runner image source (default: GHCR).
+# For self-hosted registry on the same Docker engine:
+#   RUNNER_IMAGE=localhost:5000/augur-runner:latest
+# Docker treats localhost registries as insecure by default — no daemon.json changes needed.
+# RUNNER_IMAGE=ghcr.io/aiinfuseds/augur-runner:latest
+
+# Repository to register this runner with.
+REPO_URL=https://github.com/AIinfusedS/augur
+
+# Runner identity — must be unique per runner within the repo.
+RUNNER_NAME=unraid-augur
+RUNNER_LABELS=self-hosted,Linux,X64
+RUNNER_GROUP=default
+
+# Resource limits for this repo's runner container.
+# Tune based on the repo's CI workload.
+# augur CI needs ~4 CPUs and ~4GB RAM for Go builds + extension tests.
+# 3 runners x 4 CPUs = 12 cores total.
+RUNNER_CPUS=4
+RUNNER_MEMORY=4G