Ports the runner-migration doctrine (authored by the Gemini session against
a stale checkout; grafted here onto current main so the #40-era Local-First
protocol section is preserved, not clobbered):
- CI jobs dispatch to a local Act runner on the primary developer's Mac
(label ubuntu-latest:host = native macOS host execution; the ubuntu name
is a fiction — no Linux-only steps).
- The GCP e2-micro server-side runner was REMOVED 2026-07-16; never
re-provision it (1GB RAM, OOM class). A waiting queue while the Mac is
asleep is intentional — pre-push local gates are the real discipline.
- Workflows remain canonical and install the locked universe (uv sync
--locked, committed uv.lock). GitHub mirror Actions are billing-locked
dead signals.
- CLAUDE.md gains a one-line pointer (policy stays in AGENTS.md).
[Verification]: smoke suite passed locally (175 passed); docs-only.
