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network-tiers: add neutral network.tier vocab (strict/balanced/open) to hybrid/v1 schema #300

Description

@wz-gsa

Part of the neutral-network-tiers epic (see ADR 0002 isolation, PR #299).

Scope

Add network.tier to schemas/kit-hybrid-v1.schema.json (and/or the acq config schema): enum strict | balanced | open, description that each backend maps it to its native egress primitive, and that all tiers are deny-by-default (tier only sizes the allowlist).

Requirements

  • Default when unspecified = balanced (maintainer decision 2026-08-07 — backend-consistent with sbx baseline + quickstart ADR-0018 msb default-on). balanced stays deny-by-default + curated allowlist, not allow-all.
  • Coexists with the existing caps.network.allow (effective allowlist = tier baseline ∪ per-kit allow ∪ per-sandbox additions).
  • validate-kits.py accepts/validates the new field; add tests (valid tiers, invalid tier rejected, omission → treated as balanced).
  • Update INDEX/CATALOG generation if it surfaces network config.

Depends on nothing; unblocks the adapter-mapping + baseline-data issues.

AI-assisted (OpenCode); consensus-reviewed. Requires human review.

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