Add project vision document

VISION.md

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+# GitHub Runner Fleet Vision
+
+Version: 0.1
+
+GitHub Runner Fleet is the local control plane for dependable self-hosted runner capacity across OMT-Global projects.
+
+It should make runner lifecycle, labels, runtime installation, and health visible enough that CI queue problems can be diagnosed and repaired without guesswork.
+
+## Who It Serves
+
+- The operator maintaining local and NAS-backed runner capacity.
+- Repos that rely on macOS, ARM64, Xcode, or private shell runner labels.
+- Agents that need to distinguish code failures from infrastructure queues.
+
+## Product Principles
+
+- Runner state should be inspectable from repeatable commands.
+- Labels must communicate real capability.
+- Launchd persistence and runtime setup should be source-independent where practical.
+- CI queue blockers should be reported separately from test failures.
+- Public repos should not depend on private-only runner labels.
+
+## Near-Term Direction
+
+- Harden Lume macOS pool lifecycle.
+- Improve install/runtime status surfaces.
+- Keep runner registration and label proof easy to capture.
+- Document migration paths from private self-hosted runners to hosted or public-safe policies.
+
+## Non-Goals
+
+- Do not hide CI capacity failures behind repo-specific workarounds.
+- Do not require every repo to know runner internals.
+- Do not make public CI depend on private local hardware.