docs: add governance proof conditions note

Author: LalaSkye

docs/notes/governance-proof-conditions.md

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+# Governance proof conditions
+
+A system is governed only if it can prove, at the point where an output can bind consequence:
+
+1. Valid authority existed.
+2. The action was within scope.
+3. The payload was admissible under the conditions at that time.
+4. The state transition was permitted.
+5. If not permitted, refusal occurred before mutation.
+6. A record proves that refusal occurred.
+
+**No receipt, no proof.**
+
+## Boundary
+
+This note claims that a proof layer must exist at the consequence boundary.
+
+It does not claim that the proof layer is tamper-proof.
+
+Recursive proof integrity, receipt tamper-resistance, and proof-layer optimisation are separate design questions and are not resolved here.
+
+## Inspection surface
+
+This repository is an inspection surface for the execution-boundary model.
+
+It does not evidence production deployment, regulatory approval, compliance certification, or third-party adoption.