Why: zcode lacks a rules feature (AGENTS.md is the resident layer) but
supports PreToolUse hooks that can block Edit/Write before the write lands,
upgrading A1/A3 from commit-time to write-time enforcement; the two block
shapes (integration branch, detached submodule) mirror the real incidents.
Evidence: script-level suite 8/8 (N1-N3 blocks with exit 2 and remediation
hints, P1-P5 allows incl. fail-open degradation paths); config JSON valid;
client-side live-fire interception marked pending-live in the matrix.
Impact: .zcode/config.json enables the hook runner for this workspace;
.zcode/plans/ ignored (client state); no product code change.
Refs: Development-Guidelines 0.1.0-draft.8; policy/tool-adaptation-zcode.md
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