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+# Trinity Commit Boundary v1.0
+
+**Classification:** RUNTIME_GOVERNANCE_PRIMITIVE
+**Scope:** NON_EXEC_REFERENCE_PACK
+**Authority:** HUMAN_ACTUATOR_REQUIRED
+**Exit Enum:** {ALLOW, HOLD, DENY, SILENCE}
+
+---
+
+## 0. Purpose
+
+TrinityOS governs the boundary between **EXPLORE** (advisory cognition) and **EXECUTE** (real-world action).
+
+Nothing crosses into EXECUTE without a Trinity verdict.
+
+This is **structural**, not advisory.
+
+---
+
+## 1. Boundary Function
+
+```
+INPUT → TRINITY_GATE → VERDICT → (if ALLOW) EXECUTION
+```
+
+- If there is **no VERDICT**, there is **no EXECUTION**.
+- Only `ALLOW` may cross the boundary.
+
+---
+
+## 2. Commit Payload Schema (trinity.commit.v1)
+
+```json
+{
+  "schema_version": "trinity.commit.v1",
+  "request_id": "string",
+  "timestamp_utc": "ISO8601",
+  "actor": {
+    "actor_type": "HUMAN | SERVICE | AGENT",
+    "actor_id": "string",
+    "role": "string"
+  },
+  "intent": {
+    "action_type": "string",
+    "target": "string",
+    "intent_summary": "string"
+  },
+  "context": {
+    "environment": "DEV | STAGE | PROD",
+    "domain_id": "string",
+    "record_id": "string"
+  },
+  "authority": {
+    "authority_ref": "string",
+    "authority_type": "POLICY | CONSENT | CONTRACT | SUPERVISION"
+  },
+  "risk_mode": "STANDARD | ELEVATED | CRITICAL",
+  "constraint_version": "string"
+}
+```
+
+**Invariants:**
+- No hidden fields.
+- No implicit inference.
+- No interior state.
+
+---
+
+## 3. Exit Enum
+
+| Verdict | Meaning |
+|---------|---------|
+| **ALLOW** | May cross boundary |
+| **HOLD** | Insufficient clarity or authority |
+| **DENY** | Explicitly forbidden |
+| **SILENCE** | Valid non-response; no propagation |
+
+- `SILENCE` is not failure. It is containment.
+
+---
+
+## 4. Determinism Rules
+
+- Canonical JSON ordering: lexicographic keys.
+- Encoding: UTF-8.
+- No extraneous whitespace.
+- SHA256 over canonical form.
+- Artefact hash must validate under replay.
+- No probabilistic outcomes.
+- Same input → same verdict.
+
+---
+
+## 5. Decision Artefact Schema (trinity.decision.v1)
+
+```json
+{
+  "schema_version": "trinity.decision.v1",
+  "request_id": "string",
+  "payload_hash_sha256": "64hex",
+  "verdict": "ALLOW | HOLD | DENY | SILENCE",
+  "reason_codes": ["string"],
+  "constraint_version": "string",
+  "evaluated_at_utc": "ISO8601",
+  "artefact_hash_sha256": "64hex"
+}
+```
+
+**"Sealed" means:**
+- Canonical form.
+- Deterministic hash.
+- Replay-verifiable.
+- Tamper-detectable.
+
+---
+
+## 6. Fail-Closed Rule
+
+If any of the following hold:
+- Required field missing.
+- Unknown `constraint_version`.
+- Authority undefined.
+- Canonicalisation mismatch.
+
+Then:
+- Verdict **MUST** be `HOLD` or `DENY`.
+- Verdict must **NEVER** be `ALLOW` by default.
+
+---
+
+## 7. Verification Surface (CLI Contract)
+
+```
+trinity emit payload.json → decision.json
+```
+Run Trinity gate and emit sealed decision artefact.
+
+```
+trinity verify decision.json → PASS | FAIL
+```
+Verify canonicalisation + hashes and report integrity.
+
+**Verification checks:**
+- Canonical hash integrity.
+- Artefact integrity.
+- Deterministic re-evaluation (optional in v1.0, required in v1.1).
+
+---
+
+## 8. Non-Claims (v1.0 Scope)
+
+TrinityOS v1.0 does **not** claim:
+- Cryptographic signing.
+- Hardware binding.
+- Kernel-level non-bypassability.
+- Blockchain anchoring.
+- Regulatory certification.
+
+Claims are bounded to:
+- Deterministic boundary gating.
+- Tamper-evident artefacts (SHA256 over canonical JSON).
+- Fail-closed execution control when correctly wired.
+
+---
+
+## 9. Minimal Runtime Engine (Reference Skeleton)
+
+| Component | Function |
+|-----------|----------|
+| `canonicalise.py` | Canonical JSON + SHA256 helper |
+| `trinity_gate.py` | Gate evaluator (payload → verdict + reason_codes) |
+| `emit.py` | Builds `trinity.decision.v1` artefact, attaches `artefact_hash_sha256` |
+| `verify.py` | Recomputes canonical form + SHA256, checks `artefact_hash_sha256` |
+
+Plus: golden test fixtures, determinism tests, tamper tests.
+
+---
+
+## 10. Architecture Flow
+
+```
+┌─────────────┐
+│   INPUT      │  (commit payload: trinity.commit.v1)
+└──────┬──────┘
+       │
+       ▼
+┌─────────────┐
+│ TRINITY_GATE │  (evaluate against constraints)
+└──────┬──────┘
+       │
+       ▼
+┌─────────────┐
+│   VERDICT    │  {ALLOW | HOLD | DENY | SILENCE}
+└──────┬──────┘
+       │
+       ▼ (only if ALLOW)
+┌─────────────┐
+│  EXECUTION   │  (sealed decision artefact emitted)
+└─────────────┘
+
+Fail-closed: no verdict = no execution.
+Unknown inputs = HOLD or DENY, never ALLOW.
+```
+
+---
+
+## 11. What This Achieves
+
+- A governance boundary specification (this document).
+- A commit payload schema (`trinity.commit.v1`).
+- A decision artefact schema (`trinity.decision.v1`).
+- A verifier surface (`trinity emit` / `trinity verify`).
+- An evidence surface independent of any other framework.