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Activate nesting per GH-DEC-2026-015: view_hash carries binding.digest

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approval-engine met the condition. Verified here rather than taken on report:
their docs/approval-claim.md carries "Presentation exclusion — GH-DEC-2026-015
§4" in normative language, and I ran
tests/test_claim_contract.py::test_presentation_changes_cannot_change_the_approved_act
myself — 1 passed. That test pins the digest input set from BOTH sides, and the
narrowing half is what makes it real: without it a digest over four fields, or
over a constant, would pass the widening half perfectly.

view_hash now carries binding.digest and the act-scope is no longer
independently canonicalized here, so the act has exactly one canonicalization
computed by the layer that owns it. approval_binding_digest is validated for
shape and refused without its approval id — it is carried, never computed.

The three published vectors are unchanged: they do not carry the new key, so
pick omits it. Asserted, not assumed.

The cycle condition did not disappear, its protection moved — from refusing
nesting to approval-engine's normative exclusion. layer.yaml carries it as
cycle_condition with a test, so a future widening meets a rule rather than
silence.

One thing not assumed. Both gate-house and approval-engine said our binding
slice canonicalizes principal and target, two of their five fields. target
plainly is act material and is now dropped. But their principal is the party ON
WHOSE BEHALF the approval was issued, while ours is the person being BOUND — the
approver. Different roles, and dropping ours would remove who was shown this
from view_hash and gut the promise. Kept it, declared principal_role_overlap
open in layer.yaml, tested that changing the approver still moves view_hash, and
raised it rather than silently resolving it either way.

L0/L2 are unaffected: with no approval there is no digest to defer to, and
test_act_scope_still_binds_when_there_is_no_carried_digest pins that.

100 tests pass.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V3W1dQG7GFFM9d94jFx7iR

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 1565372@bnt-lap001
Assistant-Session: 16bb2f25-b34c-49ef-8e94-5fec3567a568
This commit is contained in:
tegwick 2026-09-10 20:58:22 +02:00
parent d0302e1046
commit 4e103f62a0
7 changed files with 240 additions and 50 deletions
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7
informed_decision/canonicalize.py
View file

@ -1,6 +1,12 @@
#!/usr/bin/env python3
"""Canonicalization for informed-decision view_hash and awareness_hash.
``approval_binding_digest`` was added to the binding allow-list on 2026-09-10
under GH-DEC-2026-015, which permitted nesting for the informed-decision /
approval-engine pair. It is a digest computed by ``approval-engine`` and
**carried**, never recomputed or restated here. The published vectors do not
carry the key, so ``pick`` omits it and their hashes are unchanged.
Governed copy. The provenance original is
``history/20260909-initial-exploration/canonicalize.py`` and is never edited;
this file is the one that changes. Promoted by INFD-WP-0001-T06.
@ -21,6 +27,7 @@ from typing import Any
ALLOWED_BINDING_KEYS = (
"approval_binding_digest",
"awareness_promoted",
"binding",
"binding_level",