docs: freeze the 4.0 GA surface #382

Why

ADR-0020 defines one stable surface per capability.

In scope

Update the ADR-0020 inventory and surface table for init, status, sync and uninstall; update ga-surface-guard.

Out of scope

New commands.

Acceptance criteria

• ga-surface-guard passes against the new table

Dependencies

Blocked by: #360, #375, #379

Blocks: #389

Plan

• Release: 4.0.0-rc.1
• Size: size:M · Workstream: ws:ga-readiness
• Epic: docs: 4.0 GA readiness (epic) #303
• Card: GA-03 in the card inventory
• Sources: Supersession ledger (docs(plans): v4 GA master plan, supersession ledger and v5 registers #290) ADR-0020; Design (docs(plans): project-scoped management design and its prerequisites #289) Status

Verification

• node scripts/run-tests.mjs focus tests/kit/ga-surface-guard.test.mjs