Supplements AI-discoverability-plan.md §3.4. §3.4 was authored when no
repo shipped the Phase-0 contract; with tier-1 + tier-2 onboarded
(6 of 9 repos as of 2026-05-10), that table is stale as a priority
guide.

This doc reframes priority around the actual remaining work and
ranks it by *downstream dependents* — not by ease of shipping.

Structure:
- §2 Current-state inventory (per-repo Phase-0 contract status)
- §3 Outstanding work catalogued from parent plan §7 + phase1-plan.md
- §4 Dependency graph (ASCII; shows what blocks what)
- §5 Priority ranking by downstream-leverage (P1-A ranks #1 with 6
  downstream items; tier-3 onboarding ranks #4 despite being
  "easy" because it doesn't unblock anything)
- §6 Recommended execution order — single-threaded sequence + which
  items to parallelize when bandwidth allows
- §6.4 explicit "easy first" trap: ships three quick PRs, leaves
  nothing unblocked
- §7 Concrete recommended next move: ship P1-A as a single coherent
  PR (cuts the longest dependency chain in front of the entire
  Phase 1 + 3 + 4 stack)
- §8 How to keep the doc in sync (read-then-act discipline)

Source files referenced (all on main):
- AI-discoverability-plan.md §3.4 — original tier-based framing
- phase0-plan.md — completed
- phase1-plan.md — to-do, Track A-D layout matches §3-5 here

Prose-only gate (make check-docs-prose) green: doc is .md under docs/.