Macro-4 No-Mega-Registry Lock — R2-B2 (2026-06-19)

Date: 2026-06-19 · Workstream: R2-B2-MACRO-4-STAGING-WORKBENCH-IO-CONTRACT-TD-ENTRY-GATE-2026-06-19 (Deliverable 68 of 90) · Editorial revision: rev1 Class: no-mega-registry lock · READ-ONLY · NON-ENACTING · NON-AUTHORIZING · IO_CONTRACT_OVERREACH guard · NO write performed.

Metadata convention. Editorial revision (rev1) only. Storage revision/content_length authoritative at read time.

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0. Status and non-authorization

STATUS: PASS — engineering / design-only. Holds the IO contract envelope as a contract, never a registry. Engineering PASS ≠ authority PASS. Default: HOLD.

1. Purpose

Guarantee the standardized IO contract does not become a mega-registry / universal write surface / shared mutable hidden state.

2. Sources / evidence read

IO contract envelope (19); prompt §IO-Contract-lock (forbidden: mega-registry, universal write surface, shared mutable hidden state); Macro-3 no-mega-pipeline lock. Main process, no reader-agents.

3. Accepted baseline (carried)

Allowed: explicit input/output/error/evidence/rollback/owner/promotion contracts, a versioned envelope. Forbidden: mega-registry, mega-graph, mega-birth pipeline, universal write surface, shared mutable hidden state, implicit cross-block mutation, automatic draft→production promotion.

4. Evidence / analysis — boundary check (CLEAN)

Forbidden	In Macro-4?
a central registry storing all blocks' state	no — envelope is per-block, local
a universal write surface	no — each block writes only its own output surface
shared mutable hidden state	no — contracts are explicit, versioned, pointer-linked
implicit cross-block mutation	no — composition is by referencing output_surface only

5. Contract / requirement / matrix / result — drift trigger (→ HOLD)

Any deliverable that turns the envelope into a centralized store = IO_CONTRACT_OVERREACH → HOLD. Status this run: NOT triggered. The envelope standardizes shape, not content; it centralizes nothing.

6. Owner-gated future work

Any runtime contract store is Owner-gated and must remain non-centralizing; forbidden now.

7. What remains unresolved

The version-store mechanism is future TD and must not become a mega-registry.

8. Ready for GPT/Codex review

Yes — Codex should attack any reading of the envelope as a registry.